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.
FC-0173 spa filter equivalents
Part number FC-0173 appears in 2 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.
Dimension One Spas 4CH-950 cartridge (OEM 1561-04), 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft. Unicel 4CH-950, Pleatco PDO-UF25P2.
Unicel 4CH-950
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| OEM | 1561-04 |
|---|---|
| Unicel | 4CH-950 |
| Pleatco | PDO-UF25P2 |
| Filbur | FC-0173 |
| Size | 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Dimension One Spas section), PDF p.33 (printed p.29); spec table PDF p.7 (printed p.3) (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Dimension One Spas, printed p.33 (PDF p.17) (PDF)
- Hot Tub Outpost (retailer OEM listing): 01561-04: 4.62" x 11.50", handle, 1-1/4" SAE coarse thread; 1996–1998 Little Dipper, 1991 El Nino, also Saratoga Spas (web page)
Full details → · All Dimension One Spas spa filters · Which fitting you need · How to install it
Saratoga Spas 4CH-950 cartridge (OEM 74408-99), 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft. Unicel 4CH-950, Pleatco not listed.
Unicel 4CH-950 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 | 74408-99 |
|---|---|
| Unicel | 4CH-950 |
| Pleatco | not listed |
| Filbur | FC-0173 |
| Size | 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: Saratoga list PDF p.55: 74408-99 = 4CH-950, 4-5/8" x 12", 25 sq ft, 1-1/4" SAE. Spec table PDF p.8: 139 pleats, 25 sq ft. Price index PDF p.88: 25 sq ft. (PDF)
- Filbur Catalog & Reference Guide: Saratoga section PDF p.25: FC-0173 at 27 sq ft and 11-7/8". Size table: 25 sq ft. (PDF)
- Pleatco 2023 Catalog: Deactivated list: PDO-UF25 replacement N/A (PDF)
Not in sources: Length 12" (Unicel) vs 11-7/8" (Filbur). Filbur Saratoga section 27 sq ft vs Unicel and Filbur's size table at 25. Pleatco cell deactivated, replacement N/A..
Full details → · All Saratoga Spas spa filters · Which fitting you need · How to install it