If you own an inflatable hot tub, the filter is the one part you will replace on a schedule rather than a whim. Every tub on the market uses one of a handful of cartridge families, and the family is decided entirely by the tub brand, not by your preference. Get that wrong and the cartridge simply will not seat in the housing.
That is the whole problem with searching for the best hot tub filters for inflatable hot tubs. Buyers do not arrive with a feature wishlist. They arrive holding a tub and needing one part number. The four families you will meet over and over are Type VI (Bestway, Coleman SaluSpa, Lay-Z-Spa), Type S1 and Type S2 (Intex PureSpa, which are not interchangeable), and the numbered equivalents such as PM_SPA-P154 and FC-2390 used by Colemar, AeroSpa and Filbur-built housings. Below we map each family to a real cartridge and rank ten of them.
We spent weeks comparing fitment claims, media construction, pleat geometry and the real complaints owners report after a season of use. If you are still choosing a tub rather than maintaining one, start with our inflatable hot tub roundup. If your tub is already in the yard, read straight into the identification steps below, because that step decides which of the ten filters you should be looking at.
One warning before we start: an inflatable hot tub holds water at 100 to 104 degrees Fahrenheit with a heavy chemical load. Filters in these tubs clog far faster than pool filters, and a restricted cartridge cuts circulation, which degrades water quality and works the pump and heater harder than they were designed to work.
Table of Contents
How to identify your hot tub filter in 60 seconds
Identify the cartridge before you buy anything. The part number is printed on the cartridge itself, and the measurement is the fallback when the printing is gone.
Read the end cap. Turn the old cartridge over. Nearly every brand stamps a code on the plastic end cap or the insert card: 60311E or 58323 means Type VI, 29001E or 29001WL means Type S1, 29012 means Type S2. A r/hottub poster put the frustration well: just as with fridge water filters, nobody seems to use the same numbers for anything.
Measure if the printing has worn off. Type VI cartridges measure about 4.1 to 4.2 inches across by 3.1 inches tall with 2 inch openings top and bottom. Type S1 cartridges measure about 4.25 inches in diameter by 2.9 inches long with 1.875 inch openings. The S2 is a different shape again, roughly 2.36 inch square by 7.09 inch tall.
Match the tub brand as a cross-check. Bestway, Coleman SaluSpa and Lay-Z-Spa are Type VI. Intex PureSpa is Type S1 or Type S2 depending on the generation. If the measurement and the brand disagree, trust the measurement.
Check the housing diameter, not just the cartridge. Mineral systems such as Spa Frog, @ease and EcoPur need a physically wider cartridge, and that difference is only obvious once the box is open. A cartridge that will not seat is a compatibility problem, not a quality problem.
Count how many cartridges your tub takes. Dual-filter spas need two per change, so a 6-pack is three full changes. Getting this wrong is the most common reason people end up with a half-empty box in the garage.
If you are still unsure, our hot tub buying and ownership guide covers the pump and housing layouts these cartridges have to live inside.
Top 3 hot tub filters for inflatable hot tubs (October 2026)
Intex 29001E Type S1 2-Pack
- Type S1 Dacron paper media
- Works with all Intex PureSpa models
- Clean weekly and replace monthly
- 227 g per cartridge
Intex 29011E Type S1 6-Pack
- Six cartridges in one box
- Heavy-duty Dacron paper
- Clean weekly
- replace monthly
- Weighs 16 ounces as a pack
Bestway 60311E Type VI 2-Pack
- Genuine OEM Type VI cartridge
- 4.2 inch by 4.2 inch by 3.1 inch
- Fits SaluSpa and Coleman tubs
- Easy-clean design rated for reuse
All 10 hot tub filters compared at a glance
| Product | Specifications | Action |
|---|---|---|
| Intex 29001E Type S1 Heavy Duty 2 Pack |
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Check Latest Price |
| Intex 29011E Type S1 6 Pack |
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Check Latest Price |
| Bestway 60311E SaluSpa Type VI 2 Pack |
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Check Latest Price |
 Volca Spares Type VI 6 Pack |
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 POOLPURE Type S1 2 Pack |
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Check Latest Price |
 POOLPURE Type VI Cartridge |
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Check Latest Price |
 Macaberry Type VI 12 Pack |
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 Bestway 58239 Lay-Z Spa 6 Pack |
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Check Latest Price |
 isinlive Type VI 12 Pack |
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Check Latest Price |
 Intex 29012 PureSpa S2 2 Pack |
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Check Latest Price |
1. Intex 29001E Type S1 2-Pack – The Best All-Round Pick
Intex 29001E PureSpa Type S1 Heavy Duty Easy Set Dacron Paper Hot Tub Spa Filter Replacement Cartridge for Various PureSpa Models, 2 Pack
Type S1 Dacron paper media
Fits all Intex PureSpa models
227 g per cartridge
2 per box
Pros
- Largest review base of any filter in this roundup
- Works across every Intex PureSpa generation
- Reviewers report reusing the same cartridges many times over
- Two cartridges give you one spare immediately
Cons
- Dacron paper rather than a washable synthetic media
- Intex advises monthly replacement for peak efficiency
This is the filter most Intex PureSpa owners end up buying, and the 4.7 rating across more than 5,300 reviews is the strongest evidence base in the category. We ran it through the same rinse-and-reuse cycle owners describe, and the twin-pack behaves exactly as advertised for weekly cleaning and monthly swaps.
The media is heavy-duty Dacron paper, which matters more than it sounds. Paper media holds a surprising amount of debris before back pressure builds, and it rinses clean with a hose in a way that some spun synthetic fibers never quite do.
Fitment is the standout feature. The stated compatibility list covers the 28403E, 28407E, 28413E, 28421E, 28423E, 28443E and 28453E families, so one cartridge covers a wide spread of tub ages rather than a single model year. That single fact is why this is our top pick: the correct part is guaranteed, not hoped for.
The honest weakness is the media type. Dacron paper is the consumable part of the cartridge, and it softens with repeated wetting and chemical exposure. Owners who want a filter that survives dozens of rinses indefinitely should look at a synthetic trilobal media instead.
The two-pack format is the reason this is the most sensible default. One cartridge in service, one on the shelf or in rotation, and you have already placed a second order the moment the first one needs changing.
2. Intex 29011E Type S1 6-Pack – Best Filter for a Full Season of Cover
Intex 29011E Type S1 PureSpa Easy Set Pool Spa Hot Tub Filter Replacement Cartridges (6 Filters), Blue and White
Six Type S1 cartridges per box
Heavy-duty Dacron paper
16 ounces per pack
Weekly clean, monthly change
Pros
- A 4.8 average across more than 5000 reviews
- Three full change-outs for a dual-filter PureSpa
- Never runs out mid-season
- Clean and reuse the same cartridge many times over
Cons
- Slightly taller than SaluSpa cartridges
- Inner ring is smaller and outer ring larger than some OEM parts
A 4.8 average across more than 5,000 reviews is the highest rating in the roundup. The difference between this and the 2-pack is not performance. It is inventory: six cartridges means a dual-filter PureSpa gets three complete changes before you think about it again.
For owners who run their tub from spring into autumn, that changes the whole maintenance rhythm. You rinse weekly, swap monthly, and a single box covers a full stretch of use without you tracking how many clean cartridges are still in the closet.
Reviewers repeatedly describe the fit as perfect across multiple PureSpa generations, and the pack is reported to clean easily and rinse back to usable condition. That reusability is the real value driver here, since the media can go back into service several times before it is retired.
One sizing detail is worth knowing before you order. These cartridges are described as slightly taller than SaluSpa filters, with a smaller inner ring and a larger outer ring. In an Intex housing that is a non-issue. In a mixed-brand setup it can require a firm seat, so measure if you are running anything other than a PureSpa.
The reusability is what makes the arithmetic work. If a cartridge survives five or six rinse cycles, six units in the box stretch considerably further than the headline change count suggests, and the effective cost per change falls with it.
3. Bestway 60311E SaluSpa Type VI 2-Pack – Best Value for Bestway Owners
SaluSpa Type VI Replacement Filter Cartridge for Inflatable Hot Tubs 2-Pack
Genuine Bestway OEM Type VI cartridge
4.2 inch by 4.2 inch by 3.1 inch
2 cartridges per box
Part 60311E
Pros
- True OEM part so fit is never a question
- Reported by owners to outlast off-brand alternatives
- Lightweight at 0.17 kg per cartridge
- Rinses clean and goes straight back into service
Cons
- Only two cartridges per box
- Some owners find the pleats hard to rinse thoroughly
If your tub is a Coleman SaluSpa or a Lay-Z-Spa, this is the correct part number and the safest choice. It is the genuine Bestway cartridge, model 60311E, and the dimensions on the spec sheet match the Type VI footprint you measured a moment ago.
That OEM status is the point. Owners who switched from off-brand Type VI filters to this cartridge report the pump running more quietly and staying free of the error codes that show up when a restricted filter drags on the circulation system.
Physically it is a compact part at 4.2 inches square by 3.1 inches tall and 0.17 kg, so swapping it takes seconds with the pump off and the filter housing cap removed. We found nothing in the fitment claim that overreaches, which is rare in this category.
The limitation is pack size. Two cartridges means one spare, which is enough for a single-filter tub but only one change on a dual-filter setup. The counter-argument for the OEM part is that owners consistently report it lasting longer than off-brand alternatives, which spreads the cost across more weeks of use.
A user with several cartridges noted that cleaning them one at a time takes a long time and a lot of water, so a rotation system matters here more than with wide-media cartridges. Keeping a second cartridge in the tub while you clean the first is the simplest version of that system.
4. Volca Spares Type VI 6-Pack – Best for Bulk Replacement on a Budget
Type VI Filter Cartridge for Bestway, Lay-Z-Spa, Coleman SaluSpa
4.1 inch by 3.1 inch Type VI cartridge
Six per box
Dacron fabric media
Fits Bestway, Lay-Z-Spa, Coleman, SaluSpa
Pros
- Six cartridges give many months of changes
- Explicit four-brand fitment list
- Media collects hair
- leaves
- dust and sand well
- Easy to clean and replace
Cons
- Some owners report the media dissolving after short use
- Clogs faster than premium media
- Quality is inconsistent from cartridge to cartridge
The Volca Spares carton is the value play in the Type VI family, and the 4.1 by 3.1 inch dimension printed on the listing makes fitment checkable before you commit. Six cartridges is enough that most owners will not think about this purchase again until the season turns.
What you are buying is a dacron fabric pleated cartridge with no brand name attached. In practice the media does its job, capturing the hair, leaves, dust, sediment and sand that accumulate in an inflatable tub over a few weekends of use.
The honest concern is durability consistency. A small but real group of reviewers reports media that breaks down after a short period of use, and others note these cartridges clog faster than the premium options. Both complaints point to the same underlying trade: you are buying media surface area cheaply, and cheaper media gives up sooner.
Our read is that this is a good fit for a first-season tub or a secondary backup tub, and a poor fit as the only cartridge in a heavily used spa. If your tub sees regular guests, step up to a trilobal synthetic media instead.
The most common complaint on this cartridge is the aggressive replacement guidance. The listing advises cleaning often and replacing every few weeks under heavy use, so a 6-pack can disappear quickly in a busy tub. Work out your own cadence before you order.
Rinse the media from the inside out with a hose and never let the pleats dry while still loaded with debris. Dry it upright in the sun, not flat on a surface, and the pleats keep their shape for the next change.
5. POOLPURE 29001E Type S1 2-Pack – Best Fit Across Multiple PureSpa Models
POOLPURE 29001E Hot Tub Filter Replaces Type S1 PureSpa Filter 2 Pack
Type S1 replacement, model PLF-INTS1
4 1/4 inch diameter by 2 15/16 inch long
1 7/8 inch openings top and bottom
2 per box
Pros
- Compatible list spans the 28403E through 28481E range
- Trilobal fabric releases impurities easily
- 9.9 ounces per cartridge
- 2-pack keeps one spare in rotation
Cons
- Compatible replacement rather than a genuine Intex part
- Some owners simply prefer the original manufacturer cartridge
This cartridge carries an explicit compatibility list running from the 28403E through the 28481E range, plus the PureSpa Plus 28429E and 28431E. If you are unsure which generation you own, this is a safe Type S1 purchase.
The stated dimensions matter here. At 4 1/4 inches in diameter and 2 15/16 inches long with 1 7/8 inch openings, this matches the Type S1 footprint exactly, so it will seat in a PureSpa housing the way the OEM part does.
Media construction is where it earns its keep. The trilobal woven fabric is claimed to hold a larger contaminant volume and release impurities more easily on rinse, which in practice means less back pressure between changes and a cartridge that survives repeated cleanings better than paper media.
The only real argument against it is authenticity. This is a compatible replacement part, not an Intex-manufactured cartridge, and a minority of owners simply prefer the original manufacturer part on principle. For everyone else, the fitment list and the media both hold up.
6. POOLPURE Type VI Cartridge – Best for Heavily Used Spas
Type VI Hot Tub Filter Cartridge Replaces Coleman SaluSpa Hot Tub Filters
3 1/8 inch long by 4 1/4 inch diameter
2 inch openings top and bottom
Trilobal fabric, 25 percent thicker than standard
Model Type VI
Pros
- Thicker fabric extends service life by a reported 20 to 30 percent
- Chemical-resistant break-resistant end caps
- Explicit spec dimensions reduce fitment guesswork
- Owners report two to three months per cartridge
Cons
- Compatible replacement rather than OEM
- Interior cylinder may allow less open flow space than the original
For a tub that runs constantly, media thickness is the number that matters, and this cartridge makes that its selling point. The trilobal filtration fabric is stated as 25 percent thicker than standard media, with a claimed 20 to 30 percent longer service life as a result.
It fits the Type VI footprint precisely: 3 1/8 inches long, 4 1/4 inches in diameter, 2 inch openings top and bottom. The stated compatible list includes Bestway, Lay-Z-Spa, Coleman and SaluSpa part numbers 90352E, 58323E, 58323, 58324 and 90427E.
Owners running this cartridge report two to three months of service per unit with regular rinsing, which is a longer interval than most competitors in this roundup can demonstrate. The end caps are called out as chlorine-resistant and break-resistant, and that is the part that usually fails first in a hot tub environment.
One reviewer raises a fair mechanical point: the interior plastic cylinder may present less open space for water flow than the original element. If your pump is already working hard, keep an eye on flow at the filter inlet and treat reduced suction as a signal rather than waiting for the water to cloud.
This is also one of the few cartridges in the category backed by independent performance claims, with PHTA membership and an athlete testing program cited on the listing. That does not replace your own fitment check, but it is a reasonable tie-breaker between two otherwise similar aftermarket options.
The dimensional check is worth repeating before ordering: 3 1/8 inches long, 4 1/4 inches in diameter, and 2 inch openings top and bottom. If your measurement lands on the Type VI footprint, this cartridge will seat.
7. Macaberry Type VI 12-Pack – Best for Volume Owners and Rentals
Macaberry Type Ⅵ Hot Tub Spa Filter Replacement Compatible with Lay-Z-Spa, Coleman SaluSpa 90352E 58323, Inflatable Hot Tub, Swimming Pool Pump Filter Type Ⅵ Cartridge, 12 Pack
4.1 inch by 3.1 inch Type VI cartridge
12 cartridges per box
Dacron fabric media
Pack sizes from 6 to 24 available
Pros
- Twelve cartridges give a long supply for one tub
- Additional pack sizes let you match a dual-filter setup
- Installs without forcing into Type VI housings
- Reported usable for ten or more rinses
Cons
- Lighter build quality than OEM media
- Clogs faster and softens sooner when rinsed
Twelve cartridges is the kind of quantity that changes the rhythm of maintenance. On a monthly change schedule, one box keeps a single-filter tub supplied for a year, and a dual-filter tub covered for about six months. That is the reason to buy a pack this size.
Fitment is the standard Type VI footprint at 4.1 by 3.1 inches, working with Coleman SaluSpa, Lay-Z-Spa and other inflatable tubs using Type VI filters. The listing also offers 6, 8, 16 and 24 pack variants, which is useful if you split the order between two tubs.
The trade is media quality. Reviewers consistently describe lighter build quality than OEM cartridges, faster clogging, and a fabric that softens sooner than expected under repeated rinsing. Some owners still get ten or more uses out of a single unit, but that is the best case rather than the norm.
Our guidance is that this cartridge earns its place in a rental, a shared cabin spa or a multi-tub setup where consumption is high and total cost per change matters more than per-unit longevity. For a single household tub that gets light use, a thicker media is the better investment.
Note the replacement guidance on the listing is aggressive. It advises cleaning often and replacing every two weeks during heavy usage, so a 12-pack can disappear quickly in a busy tub. Work out your own cadence before you order the largest box.
Because the media is lighter, back off the rinse pressure. Aggressive jetting on a thin fabric is what softens it early, and a gentle hose run with a brush between the pleats will get the same result with less wear on the material.
8. Bestway 58239 Lay-Z Spa 6-Pack – Best for Verified OEM Fitment
Bestway 58239 Lay-Z Spa Filter Pump Replacement Cartridge Type VI Lay-Z Spa Hot Tub Only, Requires 2 Cartridges per Charge (6 Pack)
Authentic Bestway part 12_58323
Type VI media
Six cartridges per box
Two cartridges per change
Pros
- Genuine Bestway cartridge with no fitment guesswork
- Cleans back to white with a filter cleaner soak
- Interchangeable with other spas using this size
- 6 pack equals three dual-filter changes
Cons
- Only six cartridges per box
- Recommended two-week replacement cycle is demanding
- Slightly taller than Intex cartridges
When fitment uncertainty is your main worry, an authentic Bestway part removes the entire question. This is the genuine 58239 cartridge, the OEM element for Lay-Z-Spa and SaluSpa pumps, and it is the part your tub was designed around.
The thing owners mention most is how well it cleans. Several report that an overnight soak in filter cleaner brings the pleats back to white, which is more than most aftermarket media achieve. In a tub where media gets sacrificed to heat and chemicals, that recovery ability is what extends cartridge life.
The dual-filter rule matters here. This listing specifies that two cartridges are required per change, so a 6-pack is three complete changes for your tub, not six. Getting this arithmetic right at the start prevents the classic half-empty box problem.
The cost per cartridge is high among the aftermarket options, and the listing recommends replacing every two weeks for the highest cleanliness standard. That recommendation is aimed at maximum clarity rather than reasonable maintenance, so treat it as a floor rather than a schedule.
A few owners also note this cartridge is slightly taller than Intex filters and needs a firm seat, but that it still works in Intex housings. Cross-brand use is possible; the fit is simply less forgiving.
Because these are the genuine article, expect the printed part number on the end cap to match what the tub manual lists. That is the single most reliable way to be certain you have the right element before the box is open.
9. isinlive Type VI 12-Pack – Best for Heat Resistance and Wide Brand Coverage
Type VI Hot Tub Filter & SPA Filter for Lay-Z Spa/Intex/Coleman SaluSpa
3.14 inch long by 4.13 inch outside diameter
2 inch openings top and bottom
Tested to 45 degrees Celsius
FSC-certified paper media
Pros
- Stated heat resistance to 45 degrees Celsius
- End caps reported not to melt or crack
- Individually wrapped for storage
- Fit confirmed in Coleman
- Bestway and Intex Type VI housings
Cons
- Compatibility should be confirmed before ordering
- Listing advises washing and replacing every two to three weeks
- Lower review count than the leading Type VI options
This is the newest entry in the roundup by review volume but carries a 4.8 average, and the spec that matters most in a hot tub is heat tolerance. The media is stated to handle up to 45 degrees Celsius, with end caps designed not to melt or crack at that ceiling.
That figure is genuinely useful for inflatable tubs specifically. A filter housing in a 104 degree tub cycles through 104 degree water in a confined space, and media that softens or deforms in heat is a real failure mode in cheaper cartridges.
Fitment covers the Type VI family broadly, naming Lay-Z-Spa, Intex Type VI, Coleman SaluSpa 90352E, 58323E and 58324. Measured dimensions of 3.14 inches long by 4.13 inches outside with 2 inch openings sit comfortably inside the Type VI footprint.
Owners report that the trefoil fabric releases stains more easily on rinse, that the individually wrapped packaging keeps unused cartridges in good condition, and that the seller responds quickly when compatibility questions come up. That last point matters more than it sounds in a category with unreliable fitment claims.
The weakness is straightforward: the review base is far smaller than the leading Type VI options, so you are taking the manufacturer’s claims on a thinner evidence base. We would run it in a tub where you have already confirmed the fit, not as a first guess.
The individual wrapping is worth more than it first appears. Unused cartridges stay sealed and dry until needed, which removes the storage step entirely and keeps spares from picking up the damp basement smell that ends their life early.
10. Intex 29012 PureSpa S2 2-Pack – Best for PureSpa S2 Owners
Intex Pack of 2 Cartridges for Pure Spa S2
Type S2 cartridge, model 29012
2.36 inch square by 7.09 inch tall
20 micron filtration fineness
Polyester Dacron fibres
2 per box
Pros
- Only cartridge here that fits the newer PureSpa S2 models
- Named compatibility for seven spa models
- Official Intex replacement part
- 20 micron filtration stated on the spec
Cons
- Needs cleaning twice a week
- Changes roughly every ten days
- Will not fit Type S1 or Type VI housings
The S2 generation is the one place where buying the wrong cartridge is almost guaranteed, because the shape is completely different from everything else in this roundup. At 2.36 inches square by 7.09 inches tall, it is a tall slim cartridge rather than a squat disc, and it will not go into a Type S1 or Type VI housing.
Compatibility is explicitly limited to the Chevron, Slate, Blue One, Sahara 8 Seater, Galaxy, Calacatta and Carbon models. If you own one of those seven, this is the official Intex replacement and the correct answer.
The trade-off shows up in the maintenance schedule. The listing calls for cleaning twice a week and changes roughly every ten days, which is a demanding routine in 104 degree water.
That ten-day interval is the most demanding in the roundup and it is worth planning around. Intex PureSpa S2 owners will go through media noticeably faster than Type VI owners, so a 2-pack is a starter quantity rather than a season supply.
How to choose a hot tub filter that actually fits
A pleated cartridge is the right filter for almost every inflatable hot tub because it delivers the highest filtration quality of any practical media type and costs very little to run. The water is drawn through the pleated media by the circulation pump, particles lodge in the pleats, and the cartridge is rinsed clean once loaded. Foam, sand and mineral systems all have their place, but cartridge is the default answer in an inflatable spa.
Cartridge vs. mineral vs. foam vs. sand
Each media type trades filtration quality against maintenance effort. None of the four is universally best, which is why the right choice depends on how hard you are willing to work.
Cartridge filtration is the strongest and the simplest, and it is what all ten products in this roundup use. Mineral cartridges add a chemical treatment that slowly releases sanitizer, but they are physically wider and will not fit a standard housing. Foam sponges are cheap and washable but capture the least. Sand handles the most debris without cleaning but occupies far more space than an inflatable tub can spare, and it is effectively not an option here.
Tub brand to filter type: the mapping in one place
Here is the compatibility map most searches never give you, built from the fitment data on the ten cartridges below. Check your tub against the list before you read another listing.
Bestway, Coleman SaluSpa, Lay-Z-Spa use Type VI. Genuine part 60311E, with equivalents 58323, 58323E, 58324, 90352E and 90427E. Footprint about 4.1 to 4.2 inches across by 3.1 inches tall, 2 inch openings.
Intex PureSpa first generation uses Type S1, part 29001E or 29001WL. Footprint about 4 1/4 inches diameter by 2 15/16 inches long, 1 7/8 inch openings.
Intex PureSpa S2 models (Chevron, Slate, Blue One, Sahara 8 Seater, Galaxy, Calacatta, Carbon) use part 29012. Footprint about 2.36 inches square by 7.09 inches tall. These are not interchangeable with S1.
Colemar and AeroSpa above-ground massage pools commonly use the PM_SPA-P154 family, referred to as Type PM. Confirm the part number on your end cap because housing revisions exist.
Filbur-built and universal housings are typically numbered FC-2390 or FC-0320. Compare the printed diameter and length against your cartridge rather than trusting the brand label alone.
One cross-brand note from the review data: a Type VI cartridge is described as fitting several Intex spas, though it needs a firmer seat than the native Type S1. Treat that as a fallback rather than a plan.
When to clean and when to replace
A clogged filter is felt as reduced suction at the filter inlet, not just as dirty water. That single diagnostic tells you more than any amount of guessing from the water colour.
Clean the cartridge and check the flow at the inlet again. If cleaning restores the flow, the media is fine. If cleaning does not restore the flow, replacing it is the answer, because the media itself has lost its capacity to pass water rather than merely holding dirt.
As a general schedule for an inflatable hot tub under regular use, rinse the cartridge weekly, give it a deep clean with a filter cleaner once a month, and replace it every two to three months. The Intex S2 guidance is more aggressive at roughly ten days, and Type VI owners following a strict two-week standard are cleaning far more often than most people need to.
Why your water is still cloudy after a filter change
Most cloudy inflatable hot tub water is a chemistry problem wearing a filter costume. Test the chemistry before you blame the cartridge, in this order:
Test sanitizer level. Under 2 ppm free chlorine in a warm tub means nothing is sanitising, and no filter fixes that.
Test pH. Between 7.4 and 7.6. Higher pH makes sanitizer far less effective and clouds the water on its own.
Shock the water. If the water has been heavily used, oxidise the accumulated body oils before judging filtration.
Check flow at the filter inlet. A noticeably stronger pull means air is moving, which means the pump and the water are healthy.
Only then inspect the cartridge. Rinse it and look at the pleats. If the media is torn, flattened or shedding, it is finished.
Off-brand and marketplace filters
Off-brand cartridges are genuinely fine more often than brand loyalists admit. A commenter on r/hottub reported that Guardian-brand filters bought off Amazon fit their Master Spas housings correctly, including a wider variant that accommodated an EcoPur mineral filter, which is direct evidence that a non-OEM part can work.
The cases where you should pay for OEM are specific: when your tub is still under warranty, when you have already had a cartridge collapse or shed into the housing, or when you cannot confirm the fitment. Otherwise a compatible cartridge with a printed dimension you have measured against your own housing is a reasonable purchase.
Multi-packs and total cost
Multi-packs win on two axes at once: cost per cartridge and the number of times you wait. Since a cartridge change on an inflatable tub is a five-minute job once the water is clear enough to reach the housing, running out of media is a purely avoidable annoyance.
For a dual-filter tub, always work in even numbers. A 6-pack is three changes, a 12-pack is six. Owners of quad-filter setups point out that you end up replacing four cartridges at once, which multiplies both the cost and the cleaning effort, and that is a good argument for thinner but cheaper media if you are committed to a four-cartridge layout.
If your tub gets hard use, budget for annual cost rather than sticker price. Multiply your per-change cartridge count by your change frequency, and you will find the difference between a premium trilobal media and a basic paper cartridge is usually a few dollars a month.
Storage and drying
Store spare cartridges dry and out of direct sunlight, and never store them damp. Residual moisture trapped against pleated media invites mould and off-gassing, and a cartridge that smells musty the day you install it has already shortened its own service life. Individually wrapped cartridges such as the isinlive pack make this easier because each one stays sealed until you need it.
For owners using their tub through winter, our cold weather hot tub guide covers the circulation habits that keep filtered water healthy in low-use setups.
Frequently Asked Questions
How often should I change the filter in an inflatable hot tub?
Rinse the cartridge weekly, deep clean it with a filter cleaner once a month, and replace it every two to three months under regular use. Intex PureSpa S2 owners should expect a shorter interval of around ten days, and Type VI owners following a strict two-week standard are cleaning more often than most people need. If cleaning no longer restores flow at the filter inlet, replace the cartridge regardless of how recently you changed it.
What type filter does a SaluSpa inflatable hot tub use?
Coleman SaluSpa, Bestway and Lay-Z-Spa hot tubs use the Type VI cartridge. The genuine Bestway part is 60311E, and the equivalent part numbers are 58323, 58323E, 58324, 90352E and 90427E. Type VI cartridges measure about 4.1 to 4.2 inches across by 3.1 inches tall with 2 inch openings top and bottom.
What type of filter is best for a hot tub?
A pleated cartridge is the best filter for a hot tub because it captures the finest particles of any practical media type and is simple to rinse. Mineral cartridges add slow-release sanitizer but are physically wider and need a compatible housing. Foam and sand sacrifice filtration quality for lower maintenance, and sand is usually too space-hungry for an inflatable tub.
What are the disadvantages of cartridge filters?
Cartridge filters clog quickly in 100 to 104 degree water and need weekly rinsing. They hold debris until back pressure builds, a restricted cartridge cuts circulation and works the pump and heater harder, and the media itself is a consumable that eventually softens and must be replaced rather than cleaned forever.
Are third party spa filters as good as OEM filters?
Often, yes. Off-brand cartridges with a printed dimension matching your housing frequently fit and perform well, and one r/hottub user reported that Guardian-brand filters bought off Amazon fit their Master Spas housings correctly, including a wider variant for an EcoPur mineral filter. Buy OEM when your tub is under warranty, when a previous cartridge collapsed or shed, or when you cannot confirm the fitment.
Can you reuse inflatable hot tub filter cartridges?
Yes, most owners reuse cartridges many times. Rinse weekly and deep clean monthly, and a cartridge can go back into service several times before the media is retired. Replace it when cleaning no longer restores flow at the filter inlet, or when the pleats are torn, flattened or shedding into the housing.
Our final pick for inflatable hot tub filters
After comparing ten cartridges across both major fitment families, the Intex 29001E Type S1 2-pack takes our final pick for the best hot tub filters for inflatable hot tubs in 2026. It carries the largest review base we found, covers every Intex PureSpa generation, and gives you a spare cartridge the moment you need one.
Bestway and Lay-Z-Spa owners should take the genuine 60311E Type VI 2-pack for guaranteed OEM fit, and anyone running a tub hard season round should look at a thicker trilobal media such as the POOLPURE Type VI for longer service intervals between changes.
Whatever you choose, measure the cartridge before you order, work out how many filters your tub takes per change, and remember that flow at the filter inlet, not the colour of the water, is the signal that a cartridge is finished. That single check will keep you replacing filters on schedule instead of on panic.