4-5/8" × 4-5/8"
Cal Spas spa filters
Cal Spas hot tubs use a wide spread of cartridge sizes, from a 4-5/8" mini top-load to a 23-5/8" long in-line filter. Unicel gives OEM numbers for only some of them, so several rows are matched by size and listed without an OEM number.
Rows that we could only document from one source are not indexed on their own; they stay in the table below so you can still compare sizes.
This page lists 9 Cal Spas replacement cartridges from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog, the Filbur catalog and manufacturer and retailer pages. 7 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.
- FIL111003054CH-19, 4-5/8" (117 mm) × 4-5/8" (117 mm)See replacement
- FIL111003034CH-252, 4-5/8" (117 mm) × 8" (203 mm)See replacement
- FIL11100202; FIL11100200; FIL111002015CH-502, 5-3/16" (132 mm) × 12-1/2" (318 mm)See replacement
- 5CH-7525CH-752, 5-3/16" (132 mm) × 16-1/8" (410 mm)See replacement
- FIL117000166CH-975, 6-3/4" (171 mm) × 15-1/2" (394 mm)See replacement
- C-4305C-4305, 4-15/16" (125 mm) × 14-7/8" (378 mm)See replacement
- C-4950C-4950, 4-15/16" (125 mm) × 13-5/16" (338 mm)See replacement
- C-4995C-4995, 4-15/16" (125 mm) × 23-5/8" (600 mm)See replacement
- C-5374C-5374, 5-5/16" (135 mm) × 14-13/16" (376 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| FIL11100305 | 4CH-19 | PSG13.5P4 | FC-0122 | 4-5/8" (117 mm) × 4-5/8" (117 mm), 13 sq ft | not listed | verified |
| FIL11100303 | 4CH-252 | PMA20-F2M | not listed | 4-5/8" (117 mm) × 8" (203 mm), 25 sq ft | not listed | verified |
| FIL11100202; FIL11100200; FIL11100201 | 5CH-502 | PPM50SC-F2M | FC-0195 | 5-3/16" (132 mm) × 12-1/2" (318 mm), 50 sq ft | not listed | verified |
| 5CH-752 (Cal Spas) | 5CH-752 | PCAL60-F2M | FC-0202 | 5-3/16" (132 mm) × 16-1/8" (410 mm), 75 sq ft | not listed | verified |
| FIL11700016 | 6CH-975 | not listed | not listed | 6-3/4" (171 mm) × 15-1/2" (394 mm), 75 sq ft | not listed | unverified |
| C-4305 (Cal Spas) | C-4305 | PMT50 | FC-1630 | 4-15/16" (125 mm) × 14-7/8" (378 mm), 50 sq ft | not listed | verified |
| C-4950 (Cal Spas) | C-4950 | PRB50-IN | FC-2390 | 4-15/16" (125 mm) × 13-5/16" (338 mm), 50 sq ft | not listed | verified |
| C-4995 (Cal Spas) | C-4995 | PCAL100 | FC-2940 | 4-15/16" (125 mm) × 23-5/8" (600 mm), 100 sq ft | not listed | verified |
| C-5374 (Cal Spas) | C-5374 | PLBS75 | FC-2971 | 5-5/16" (135 mm) × 14-13/16" (376 mm), 75 sq ft | not listed | verified |
4 of these rows do not have enough detail for a stand-alone page (for example, no OEM number or no second cross-reference), so their pages are kept out of search results and this table is the main reference for them.
Brands that share cartridges with Cal Spas
- Coleman Spas, same part numbers 4CH-252, C-4950
- Maax Spas, same part numbers C-4950, C-5374
- Sundance, same part numbers C-4305, C-4950
- Waterway Plastics, same part numbers C-4950, C-4995
- Beachcomber, same part number C-4950
Guides that apply to Cal Spas
- How to clean a Cal Spas filter, and the 2026 manual’s part numbers
- 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 Cal Spas 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
-
4CH-19 cartridge (OEM FIL11100305) -
4CH-252 cartridge (OEM FIL11100303) 4-5/8" × 8"
-
5CH-502 cartridge (OEM FIL11100202) 5-3/16" × 12-1/2"
-
5CH-752 cartridge 5-3/16" × 16-1/8"
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.