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.
4CH-949 spa filter equivalents
Part number 4CH-949 appears in 3 cross-reference rows below. Each row lists the OEM, Unicel and Pleatco numbers that the source documents treat as interchangeable, plus the cartridge size so you can confirm against your old filter.
The same numbers, on one page, are in the cross-reference lookup. A schedule for this part number, and the buy link, are on the replacement schedule and reorder page. Published intervals by brand are in the replace and clean calculator.
Master Spas 4CH-949 cartridge, 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft. Unicel 4CH-949, Pleatco PWW50L.
Unicel 4CH-949
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| OEM | |
|---|---|
| Unicel | 4CH-949 |
| Pleatco | PWW50L |
| Filbur | FC-0172 |
| Size | 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Master Spas section), PDF p.45 (printed p.41); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Unicel-to-Filbur reverse cross reference, printed p.66 (PDF p.34) (PDF)
Not in sources: no model/model-year fitment in sources; Unicel lists no OEM part number for this brand entry.
Full details → · All Master Spas spa filters · Which fitting you need · How to install it
PDC Spas 4CH-949 cartridge (OEM FLT-SWIM50-CART), 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft. Unicel 4CH-949, Pleatco PWW50L.
Unicel 4CH-949 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.
| OEM | FLT-SWIM50-CART |
|---|---|
| Unicel | 4CH-949 |
| Pleatco | PWW50L |
| Filbur | FC-0172 |
| Size | 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft |
Sources
- PDC Spas (manufacturer filter guide, 2025): Synergy, Summit, Splash, Vitality, and the hot-tub zone of dual-zone models, 2009–present: FLT-SWIM50-CART, 50 sq ft, 5" × 13-1/16", 1-1/2" female SAE (38 mm), Unicel 4CH-949 (PDF)
- Unicel 2026 Replacement Guide: Spec table PDF p.9 (printed p.5): 4CH-949, 4-15/16" × 13-1/2", 210 pleats, 3 oz, 50 sq ft, 2" female SAE, note for a 1-1/2" male SAE standpipe. Waterway line: 817-4050 = 4CH-949. (PDF)
- Pleatco 2023 Catalog: PDF p.32: PWW50L, 5" × 13-3/16", 1-1/2" female SAE, 50 sq ft. PDF p.47: 4CH-949 = PWW50L. (PDF)
- Filbur Catalog & Reference Guide: PDF p.9 (printed p.17): FC-0172 = 4CH-949, 13-1/2", 2" female SAE, 50 sq ft (PDF)
Not in sources: Length 13-1/16" (PDC) vs 13-3/16" (Pleatco) vs 13-1/2" (Unicel, Filbur). Thread wording: PDC and Pleatco 1-1/2" female SAE; Unicel and Filbur 2" female SAE, with Unicel’s note that it fits a 1-1/2" male SAE standpipe. Diameter 5" (PDC, Pleatco) vs 4-15/16" (Unicel, Filbur). Not in Filbur’s PDC section..
Full details → · All PDC Spas spa filters · Which fitting you need · How to install it
Waterway Plastics 4CH-949 cartridge (OEM 817-4050), 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft. Unicel 4CH-949, Pleatco PWW50L.
Unicel 4CH-949 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.
| OEM | 817-4050 |
|---|---|
| Unicel | 4CH-949 |
| Pleatco | PWW50L |
| Filbur | FC-0172 |
| Size | 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft |
Sources
- Unicel 2026 Replacement Guide: Waterway list PDF p.64: 817-4050 = 4CH-949, Teleweir, 4-15/16" x 13-1/2", 50 sq ft. Spec table PDF p.9: 210 pleats, 2" female SAE, standpipe note. (PDF)
- Waterway Plastics Service Logic cartridge table: Fetched 2026-11-09: 817-4050, 50 sq ft, 4-15/16" x 13-1/2", SAE thread (web page)
- Pleatco 2023 Catalog: Spec table PDF p.32: PWW50L, OEM 817-4050. Cross-reference PDF p.47: 4CH-949 = PWW50L. (PDF)
- Filbur Catalog & Reference Guide: FC-0172 in the Rising Dragon section: 4CH-949, 4-15/16" x 13-1/2", 2" female SAE, 50 sq ft (PDF)
Not in sources: Outside diameter 4-15/16" vs Pleatco 5". Length 13-1/2" vs Pleatco 13-3/16". Female thread 2" (Unicel, Filbur) vs 1-1/2" (Pleatco). Filbur's 4CH-949 row does not print 817-4050..
Full details → · All Waterway Plastics spa filters · Which fitting you need · How to install it