Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Saratoga Spas OEM 20241-238 spa filter (4CH-20)
Saratoga Spas
Replacement numbers
Unicel 4CH-20, Pleatco PSG25P4
Fits Saratoga Spas OEM 20241-238.
Diameter 4-5/8" (117 mm)Length 6-3/4" (171 mm)20 sq ftUnicel 4CH-20
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| Unicel | 4CH-20 |
|---|---|
| Pleatco | PSG25P4 (Spec table PDF p.31: PSG25P4, 4-3/4" x 6-1/2", 1-1/2" MPT, 25 sq ft, OEM 20241-238. PSG25-XP4 is the no-adapter twin, same OEM and size. Cross-reference PDF p.47 has no 4CH-20 line. Deactivated list: PHC25 and PHC25P4 replacement N/A.) |
| Filbur | FC-0125 |
| Top | molded cone handle |
| Bottom | 1-1/2" MPT |
Bottom: 1-1/2" MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 20 sq ft media.
Saratoga Spas files this cartridge as 4CH-20 cartridge (OEM 20241-238), in the Saratoga Spas group. Numbers on the row: OEM 20241-238; Unicel 4CH-20; Pleatco PSG25P4; Filbur FC-0125. 4-5/8" across, 6-3/4" long, top molded cone handle, bottom 1-1/2" MPT, 20 sq ft.
20241-238 carries this note from the catalogs: Short Saratoga top-load, 1-1/2" MPT. Unicel's spec table, price index, and Saratoga line all say 4-5/8" x 6-3/4", 204 pleats, 20 sq ft, for OEM 20241-238. That 20 is what is stored. Unicel's Vita line prints the same 4CH-20 as PVT 25 at 25 sq ft. Pleatco PSG25P4 is 4-3/4" x 6-1/2", 25 sq ft, OEM 20241-238. The 2023 Unicel cross-reference has no 4CH-20 line. Filbur's Saratoga section prints FC-0125 at 15 sq ft and names the Pleatco cell PHC25, which Pleatco deactivates with replacement N/A. Filbur's size-table description says 20 sq ft and its column says 25. Filbur's Vita section prints 25 sq ft for OEM PVT-25. The 1-1/4" SAE cartridge of this length is 4CH-920, not this one.
4CH-20 (OEM 20241-238), Pleatco side: Spec table PDF p.31: PSG25P4, 4-3/4" x 6-1/2", 1-1/2" MPT, 25 sq ft, OEM 20241-238. PSG25-XP4 is the no-adapter twin, same OEM and size. Cross-reference PDF p.47 has no 4CH-20 line. Deactivated list: PHC25 and PHC25P4 replacement N/A..
20241-238, Filbur note: Saratoga section PDF p.25: FC-0125, 4-5/8" x 6-3/4", 1-1/2" MPT, PHC25, 4CH-20, 15 sq ft. Size table: description '20 sq. ft. Top Load,' column 25. Vita section PDF p.28: 25 sq ft, OEM PVT-25..
4CH-20 is easy to confuse on the Saratoga Spas table. 4CH-920 differs by Unicel 4CH-920, no Pleatco number, Filbur FC-0124, bottom 1-1/4" SAE, no OEM number, note says Same 4-5/8" x 6-3/4" body as 4CH-20, with a 1-1/4" SAE bottom instead of 1-1/2" MPT. Unicel's Saratoga line prints no OEM number. Spec table and price index: 204 pleats, 20 sq ft. Filbur FC-0124 prints 15 sq ft and the Pleatco cell PSG13.5. Pleatco's PSG13.5P4 is 4-3/4" x 5-15/16" and 14 sq ft, OEM 303575, which is not this length and is not on Unicel's Saratoga list, so it is not stored as the equivalent. The 2023 cross-reference has no 4CH-920 line. Filbur's footnote says to remove Saratoga's adapter and match the replacement to the fitting that remains.. 4CH-21 differs by Unicel 4CH-21, Pleatco PTL18P4, Filbur FC-0121, 8" long, 19 sq ft, OEM 20245-238, note says 1-1/2" MPT, 4-5/8" x 8". Unicel's spec table: 158 pleats, 19 sq ft. The Saratoga line names OEM 20245-238. Pleatco PTL18P4 is the same length and 18 sq ft, and the spec line also names Vita PVT-25N. Filbur FC-0121 agrees with Unicel's 19 sq ft. The 19 stored here is Unicel's and Filbur's figure..
Left blank on purpose: Area 20 (Unicel spec, price index, Saratoga line) vs 25 (Unicel Vita line, Pleatco, Filbur Vita section, Filbur size-table column) vs 15 (Filbur Saratoga section). Length 6-3/4" vs Pleatco 6-1/2". Outside diameter 4-5/8" vs Pleatco 4-3/4"..
Pages checked for 20241-238: Unicel 2026 Replacement Guide on 4CH-20 (Saratoga list PDF p.55: 20241-238 = 4CH-20, 4-5/8" x 6-3/4", 20 sq ft, 1-1/2" MPT. Spec table PDF p.7: 204 pleats, 20 sq ft. Price index PDF p.88: 20 sq ft. Vita list PDF p.63: PVT 25 = 4CH-20 at 25 sq ft.). Pleatco 2023 Catalog on 4CH-20 (Spec table PDF p.31: PSG25P4, OEM 20241-238, 4-3/4" x 6-1/2", 25 sq ft. Deactivated list: PHC25 replacement N/A.). Filbur Catalog & Reference Guide on 4CH-20 (Saratoga section PDF p.25: FC-0125 at 15 sq ft. Size table column 25. Vita section PDF p.28: 25 sq ft for PVT-25.).
If you know the Saratoga Spas model and not the part number, use the Saratoga Spas filter by model and year lookup.
Check the cartridge you removed
Measure diameter, length, and both ends, then compare them with the figures above. The steps are in the measuring guide. Why the bottom decides whether it seals: open-end vs threaded filters. Power, the retainer, and not running the spa empty: how to install a cartridge. Number formats: how Filbur, Unicel and Pleatco numbers compare.
Other Saratoga Spas cartridges
- 4CH-920 cartridge (1-1/4" SAE), 4-5/8" (117 mm) × 6-3/4" (171 mm)
- 4CH-21 cartridge (OEM 20245-238), 4-5/8" (117 mm) × 8" (203 mm)
- 4CH-24 cartridge (OEM 20254-238), 4-5/8" (117 mm) × 9-3/4" (248 mm)
- 4CH-30 cartridge (OEM 74407-98), 4-5/8" (117 mm) × 11-7/8" (302 mm)
- 4CH-950 cartridge (OEM 74408-99), 4-5/8" (117 mm) × 12" (305 mm)
All 6 Saratoga Spas spa filters
Every number on this row, on one screen: cross-reference lookup. Published clean and replace intervals for this cartridge, and a buy link for the numbers above: replacement schedule and reorder. The interval comparison by brand: calculator.
Cleaner and test strips
Hose rinse and soak steps are in how to clean a cartridge. Named cleaners and strips are in filter cleaners and test strips.
Filter cleaner and test strips
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Leisure Time O Filter Clean Cartridge Cleaner Listing title: cartridge cleaner, 32 fl oz.
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SpaGuard Filter Cleaner Listing title: filter cleaner for spas and hot tubs, 1 quart.
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AquaChek SPA 6-in-1 Test Strips Listing title: reads total bromine, total chlorine, free chlorine, pH, total alkalinity and total hardness.
Unicel 4CH-20 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Sources
- Unicel 2026 Replacement Guide: Saratoga list PDF p.55: 20241-238 = 4CH-20, 4-5/8" x 6-3/4", 20 sq ft, 1-1/2" MPT. Spec table PDF p.7: 204 pleats, 20 sq ft. Price index PDF p.88: 20 sq ft. Vita list PDF p.63: PVT 25 = 4CH-20 at 25 sq ft. (PDF)
- Pleatco 2023 Catalog: Spec table PDF p.31: PSG25P4, OEM 20241-238, 4-3/4" x 6-1/2", 25 sq ft. Deactivated list: PHC25 replacement N/A. (PDF)
- Filbur Catalog & Reference Guide: Saratoga section PDF p.25: FC-0125 at 15 sq ft. Size table column 25. Vita section PDF p.28: 25 sq ft for PVT-25. (PDF)
Not in sources: Area 20 (Unicel spec, price index, Saratoga line) vs 25 (Unicel Vita line, Pleatco, Filbur Vita section, Filbur size-table column) vs 15 (Filbur Saratoga section). Length 6-3/4" vs Pleatco 6-1/2". Outside diameter 4-5/8" vs Pleatco 4-3/4"..