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Intex PureSpa and Bestway Lay-Z-Spa filters: S1, S2 and Type VI

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Intex PureSpa tubs use two different cartridges. Type S1 is sold as 29001E (two-pack), 29011E (six-pack) and single part 11692; Unicel lists it as C-4317 and Pleatco as PIN4PAIR, at 4-1/4" × 2-15/16"[32][33][5][2]. Type S2 is 29012E (two-pack) and single part 13435, and Intex gives the size as 3.375" × 5.125" for PureSpa models whose cartridge is built into the control unit[34][35]. Bestway’s SaluSpa Type VI cartridge is 4.2" × 3.1", and Lay-Z-Spa says Type VI fits every Lay-Z-Spa except the Monte Carlo[36][37].

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Why the set number matters more than the brand name

An inflatable spa does not use the 6" or 8" cartridge a hardshell Hot Spring or Caldera uses. The cartridges are a few inches each way, and Intex has sold two of them under names that look alike. The set number on the box or on the spa, including the letters at the end, is what Intex’s own compatible-item lists use. A retailer search for “Intex spa filter” mixes S1 and S2. The lists do not.

These cartridges are also absent from the usual hardshell cross-reference in one important way. S1 is in the Unicel 2026 guide and the Pleatco 2023 catalog. S2 and the Bestway Type VI cartridge are not in those catalogs, so there is no Unicel C-number or Pleatco P-number to fall back on. You order the manufacturer’s part, then compare the size Intex or Bestway prints.

Type S1: 29001E, 29011E and part 11692

Intex’s product page for the Type S1 twin pack is SKU 29001E, described as the PureSpa replacement filter. The six-pack is SKU 29011E. The replacement-part page for a single cartridge is part 11692, and that page is the compatible-item list[32][33]. Unicel prints OEM 29001 and 11692 and lists the cartridge as C-4317. Pleatco’s spec table prints OEM 29001E as PIN4PAIR, which is a two-cartridge pack, not a different body[5][2].

What you might seeWhat it refers to
29001EIntex Type S1 twin pack
29011EIntex Type S1 six-pack
11692Intex single S1 replacement cartridge
Unicel C-4317Unicel’s listing of that S1 body
Pleatco PIN4PAIRPleatco’s two-cartridge pack for OEM 29001E

Body size is the number the catalogs agree on: 4-1/4" diameter by 2-15/16" long, rated 4 sq ft on the Unicel row. The end-cap opening is the number they do not agree on. Unicel prints 2-1/16" open at both ends. Pleatco prints 1-5/8"[5][2]. Our C-4317 page keeps both and treats the body size as the match. Hold a new cartridge against the old one if you are crossing from one brand’s listing to the other.

Intex’s 11692 compatible-item list is the model list on that page. It includes, among others, PureSpa set numbers 28403E, 28405E, 28407E and 28409E (Intex marks those four 2019 sets with the year), plus 28421E, 28425E, 28427E, 28429E, 28431E, 28433EP, 28433WL, 28435E, 28439E, 28441E and 28453E[33]. A retailer listing for 29001E has named extra set numbers that are not on Intex’s list. We do not add those. If your set number is not on the 11692 page, do not assume S1 fits. Check the S2 list next, because several of the same digits move to S2 when the suffix changes.

Type S2: the suffix is the whole story

Intex’s S2 twin pack is SKU 29012E. The single replacement is part 13435. Intex prints the size as 3.375" × 5.125" and says the S2 is only for PureSpa models with the cartridge built into the control unit[34]. That is a different shape from S1: S1 is a short, wide cartridge (4-1/4" across and under 3" tall). S2 is narrower and taller. They do not swap.

The 13435 compatible-item list names 28425EG, 28425EH, 28427EG, 28427EH, 28439EH, 28441EH and 28449EH[35]. Compare that with the S1 list. 28425E, 28427E, 28439E and 28441E are on the S1 list. The same digits with an EG or EH suffix are on the S2 list. “28425” without the suffix is not a filter choice. Read the full set number on the box or in the manual.

Our 29012E page also records that one retailer listing prints 3.5" × 6.25" per filter. That figure does not match Intex’s 3.375" × 5.125", so the page shows Intex’s size. There is no Unicel or Pleatco equivalent in the catalogs we use. Search by 29012E or 13435, not by a C-number.

Bestway Type VI, and the Monte Carlo exception

Bestway’s US product page for the SaluSpa Type VI two-pack gives the size as 4.2" across and 3.1" tall, for Bestway’s SaluSpa line[36]. The Lay-Z-Spa UK page for Filter Cartridge VI says it is compatible with all Lay-Z-Spa hot tubs except the Monte Carlo, which has its own rigid-spa cartridge[37]. Neither of those manufacturer pages is where we got a numeric part. The retail model 58323 / 58323E-BW is the number recorded on our Bestway 58323 page from the retailer listing that page cites. Order from a listing whose title says Type VI, and compare 4.2" × 3.1" with the old cartridge. If the spa is a Monte Carlo, stop and use the rigid-spa cartridge Lay-Z-Spa sells for that model. The Type VI page says it does not fit.

Unicel, Pleatco and Filbur do not list a Type VI equivalent. There is no C-number to print, and the page does not invent one.

How these small cartridges get used

S1 and S2 are small media areas next to a hardshell cartridge of 30 to 75 sq ft. Intex sells them in multi-packs because owners go through them, not because the spa holds two different types at once. A twin pack is two of the same cartridge in the box. It is not a statement that the spa takes an S1 and an S2 together.

Nothing on Intex’s S1 or S2 pages reprints the hose-and-soak procedure Unicel publishes for pleated spa cartridges[4]. Follow the care card that came with the spa. What does transfer from the hardshell manuals is the reason to keep a spare: Jacuzzi says not to run a spa with no filter installed, because unfiltered water carries debris to the pump and the heater[10]. That warning is not written for PureSpa specifically. It is the reason a two-pack is useful. Rinse or swap before the little cartridge collapses, and see what a clogged or missing filter does for the flow faults hardshell controls display when a cartridge plugs.

If you also own a hardshell tub, do not borrow its cartridge. A Hot Spring C-6430 is 6" × 10-1/2". It will not fit a PureSpa. The size lookup will show you that immediately if you type the diameter and length.

A short decision list

  1. Find the full set number, letters included.
  2. If it is on Intex’s 11692 list, you need Type S1 (29001E, 29011E or 11692). Open the S1 page.
  3. If it is on Intex’s 13435 list, or the letters are EG or EH on a number that looks like an S1 set, you need Type S2 (29012E or 13435). Open the S2 page.
  4. If the spa is a SaluSpa or a Lay-Z-Spa other than Monte Carlo, you need Type VI, about 4.2" × 3.1". Open the Type VI page.
  5. If it is a Monte Carlo, use Lay-Z-Spa’s rigid-spa cartridge, not Type VI[37].

If you would rather start from your set number or model year, the Intex filter by set number and year and Bestway filter by model and year lookups list every set and model Intex’s and Bestway’s own documents name, with the year each appears.

Hardshell cross-reference, for when the tub is not inflatable, starts at how Filbur, Unicel and Pleatco numbers compare.

Search inflatable-spa filters on Amazon

Part-number searches

Match the listing title to S1, S2 or Type VI. A search can return both Intex types.

Questions

Is Intex 29001E the same filter as 29012E?

No. 29001E is the Type S1 twin pack (Unicel C-4317, about 4-1/4" × 2-15/16"). 29012E is the Type S2 twin pack, which Intex sizes at 3.375" × 5.125" and limits to PureSpa models with the cartridge in the control unit.

My set number is 28425E. Which filter?

28425E is on Intex’s S1 compatible list (part 11692). 28425EG and 28425EH are on the S2 list (part 13435). The letters decide it.

Does every Lay-Z-Spa use the Type VI cartridge?

Lay-Z-Spa’s Type VI page says it fits all Lay-Z-Spa hot tubs except the Monte Carlo. Bestway’s US page gives the Type VI size as 4.2" × 3.1" for SaluSpa. The Monte Carlo uses a separate rigid-spa cartridge.

Why is there no Unicel number for the Bestway filter or the Intex S2?

Those parts are not in the Unicel 2026 or Pleatco 2023 catalogs we use. S1 is in both. S2 and Type VI are identified from the manufacturers’ own pages, so we do not invent a C-number.

Sources

  1. Pleatco 2023 Catalog (Pentair)
  2. Unicel: Maintenance & FAQ
  3. Unicel 2026 Replacement Guide
  4. Jacuzzi: Hot Tub Filter Cleaning Made Easy
  5. Intex: Type S1 filter cartridge twin pack (29001E)
  6. Intex: Spa cartridge S1 (part 11692) compatible item list
  7. Intex: Type S2 filter cartridge twin pack (29012E)
  8. Intex: Spa cartridge S2 (part 13435) compatible item list
  9. Bestway USA: SaluSpa Type VI filter cartridge
  10. Lay-Z-Spa UK (Bestway): Filter Cartridge VI

This guide summarizes published manufacturer and public-health guidance; always follow your own spa’s owner’s manual. See our disclaimer.

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