4-1/4" × 2-15/16"
Intex spa filters
Intex PureSpa inflatable hot tubs use two different spa filter cartridges, and the set number on your spa decides which one you need. The older Type S1 cartridge is sold by Intex as 29001E (two-pack), 29011E (six-pack) and single part 11692; Unicel lists it as C-4317 and Pleatco as PIN4PAIR. The newer Type S2 cartridge is sold as 29012E (two-pack) and single part 13435, and Intex says it fits only PureSpa models whose cartridge is built into the control unit.
Watch the letter suffix on your set number. Intex's own compatibility lists put 28425E, 28427E, 28439E and 28441E on the S1 cartridge, while the EG and EH versions of those same sets (for example 28425EG or 28441EH) take the S2. Both lists on this site are taken from Intex's replacement-part pages, so they reflect what the manufacturer says rather than a retailer's guess. The model years Intex's parts archive gives for each set are on the Intex filter by set number and year page.
These are small hot tub filters, roughly 3 to 5 inches each way, and they clog quickly because an inflatable spa has a modest pump and a lot of bather load for its water volume. Rinse the cartridge with a hose every couple of days of use and keep a spare pair so one set can dry while the other is in the spa; a fully dry cartridge is easier to clean and lasts longer.
The S1 row is still flagged: Unicel and Pleatco disagree on the end-cap opening (2-1/16" vs 1-5/8"), and Intex itself does not publish dimensions for the S1. For the S2, Intex gives 3.375" x 5.125", while one retailer listing prints a larger size, so we show Intex's figure.
This page lists 2 Intex replacement cartridges from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog and manufacturer and retailer pages, plus model and model-year fitment for 2 of them (31 hot tub models in total). 0 have a Filbur number. Find your spa filter by the OEM part number on the end cap, or measure it and compare sizes below.
Clean and replace intervals for one cartridge on this list, plus the cross-reference numbers and a buy link: filter replacement schedule and reorder.
- 29001E; 29011E; 29001; 11692C-4317, 4-1/4" (108 mm) × 2-15/16" (75 mm)See replacement
- 29012E; 13435not listed, 3-3/8" (86 mm) × 5-1/8" (130 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| 29001E; 29011E; 29001; 11692 | C-4317 | PIN4PAIR | not listed | 4-1/4" (108 mm) × 2-15/16" (75 mm), 4 sq ft | 24 models | unverified |
| 29012E; 13435 | not listed | not listed | not listed | 3-3/8" (86 mm) × 5-1/8" (130 mm) | 7 models | verified |
Know your model but not the part number? See Intex filter by model and year.
Guides that apply to Intex
- Intex PureSpa S1 and S2 filters
- Open-end vs threaded hot tub filters
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search Intex part numbers on Amazon
Each button opens an Amazon search for that part number. The cartridge page is where the cited size and fittings are. Match those before you buy.
Part numbers from this table
-
C-4317 cartridge (OEM 29001E) -
Type S2 cartridge (Intex 29012E) 3-3/8" × 5-1/8"
Disclosure: we may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Amazon links on this page go to Amazon.com and are affiliate links; they never change what we write, and the list is not ranked by commission. Each “Search on Amazon” button opens an Amazon search for the part or product name shown, not a single listing we pre-checked. Check size, quantity and your spa maker’s guidance before you buy. See our affiliate disclosure.
Model-year fitment comes only from the sources named on each cartridge page. Where no source lists models or years, the page says so.