4-5/8" × 6-3/4"
Saratoga Spas spa filters
Saratoga’s short top-load cartridge is one 6-3/4" body with two bottoms. OEM 20241-238 is the 1-1/2" MPT cartridge, Unicel 4CH-20. The 1-1/4" SAE cartridge is 4CH-920, and Unicel prints no OEM number for it. Filbur says to remove Saratoga’s adapter and match the replacement to the fitting that is left.
Unicel rates 20241-238 at 20 sq ft. Pleatco’s PSG25P4 rates that OEM at 25 sq ft and a half-inch shorter, and Filbur’s Saratoga section prints 15. The longer MPT numbers are 20245-238, 20254-238, and 74407-98. The conflicts are on the Saratoga filter page.
This page lists 6 Saratoga Spas replacement cartridges from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog and the Filbur catalog. 6 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.
- 4CH-204CH-20, 4-5/8" (117 mm) × 6-3/4" (171 mm)See replacement
- 4CH-9204CH-920, 4-5/8" (117 mm) × 6-3/4" (171 mm)See replacement
- 4CH-214CH-21, 4-5/8" (117 mm) × 8" (203 mm)See replacement
- 4CH-244CH-24, 4-5/8" (117 mm) × 9-3/4" (248 mm)See replacement
- 4CH-304CH-30, 4-5/8" (117 mm) × 11-7/8" (302 mm)See replacement
- 4CH-9504CH-950, 4-5/8" (117 mm) × 12" (305 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| 4CH-20 (Saratoga Spas) | 4CH-20 | PSG25P4 | FC-0125 | 4-5/8" (117 mm) × 6-3/4" (171 mm), 20 sq ft | not listed | verified |
| 4CH-920 (Saratoga Spas) | 4CH-920 | not listed | FC-0124 | 4-5/8" (117 mm) × 6-3/4" (171 mm), 20 sq ft | not listed | verified |
| 4CH-21 (Saratoga Spas) | 4CH-21 | PTL18P4 | FC-0121 | 4-5/8" (117 mm) × 8" (203 mm), 19 sq ft | not listed | verified |
| 4CH-24 (Saratoga Spas) | 4CH-24 | PGS25P4 | FC-0131 | 4-5/8" (117 mm) × 9-3/4" (248 mm), 25 sq ft | not listed | verified |
| 4CH-30 (Saratoga Spas) | 4CH-30 | not listed | FC-0141 | 4-5/8" (117 mm) × 11-7/8" (302 mm), 30 sq ft | not listed | verified |
| 4CH-950 (Saratoga Spas) | 4CH-950 | not listed | FC-0173 | 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft | not listed | verified |
Know your model but not the part number? See Saratoga Spas filter by model and year.
Brands that share cartridges with Saratoga Spas
- Dimension One Spas, same part numbers 4CH-30, 4CH-950
- Freedom Spas, same part number 4CH-30
- Master Spas, same part number 4CH-20
- Softub, same part number 4CH-20
- Sundance, same part number 4CH-30
Guides that apply to Saratoga Spas
- Open-end vs threaded, for the MPT and SAE bottoms
- The discontinued open cartridge that points at 4CH-20
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search Saratoga 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
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4CH-20 cartridge (OEM 20241-238) -
4CH-920 cartridge (1-1/4" SAE) 4-5/8" × 6-3/4"
-
4CH-21 cartridge (OEM 20245-238) 4-5/8" × 8"
-
4CH-24 cartridge (OEM 20254-238) 4-5/8" × 9-3/4"
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.