Pleatco PJ25-IN-4 = Unicel C-5625 = Filbur FC-1425
25 sq ft hot tub filter, 5" diameter × 13-1/4" long. Top: 2-3/8" open · Bottom: 2-3/8" open. Pleatco application: Jacuzzi CFR/CFT 25, 37.
Interchangeable cartridges
- Unicel C-5625 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.10 (Cartridges by series (dimensional listing))
- Filbur FC-1425 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.33 (Reverse cross reference (Unicel to Filbur)) Filbur p.9 (Dimensional cartridge listing)
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PJ25-IN-4 source | Unicel C-5625 source | Filbur FC-1425 source |
|---|---|---|---|
| Outside diameter | 5" | 5" | 5" |
| Length | 13-1/4" | 13-5/16" | 13-5/16" |
| Top end | 2-3/8" open | 2-3/8" / open | 2-3/8" open |
| Bottom end | 2-3/8" open | 2-3/8" / open | 2-3/8" open |
| Filter area | 25 sq ft | 25 sq ft | 25 sq ft |
| Pleats | not listed | 103 | not listed |
| Media weight | 4 oz/yd² | 4 oz/yd² | not listed |
Where to buy
Search any retailer for C-5625 or PJ25-IN-4 or FC-1425. These are the same cartridge under different brand names.
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OEM part numbers this cartridge replaces
As printed in the cited aftermarket catalogs. Match the number on your old cartridge or in your spa manual exactly.
Hot tub brands that use it
From the spa-manufacturer cross reference in the Unicel 2026 Replacement Guide. A brand may use several sizes, so check your measurements.
- Emerald Spas Unicel p.35
- Jacuzzi Brothers (models: CFR-25 (in-line), CFT-25 (in line); OEM 42-2891-08-R) Unicel p.41
- Jacuzzi Whirlpool Bath (models: Caressa (pre-1986), Espree, Espree, II; OEM 5475000) Unicel p.42
- Seven Seas Unicel p.55
FAQ
What is the Unicel equivalent of Pleatco PJ25-IN-4?
The catalogs cross-reference Pleatco PJ25-IN-4 to Unicel C-5625.
What is the Filbur equivalent of Pleatco PJ25-IN-4?
The catalogs list Filbur FC-1425.
What size is the PJ25-IN-4 filter?
Pleatco lists PJ25-IN-4 as 5" outside diameter by 13-1/4" long, top: 2-3/8" open, bottom: 2-3/8" open, 25 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 42-2891-08-R, 2590000, 5475000, 42-3533-00-R.
Sources: Filbur Product Catalog and Reference Guide (2024) · Filbur Product Catalog and Reference Guide (2024) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Unicel 2026 Replacement Guide. Last checked 2026-10-21.