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C-4326 spa filter equivalents
Part number C-4326 appears in 3 cited 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.
Hot Spring C-4326 cartridge (OEM 33521)
| OEM | 33521 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | — |
| Size | 4-15/16" × 13-5/16", 25 sq ft |
Sources
- Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.38; spec table PDF p.8 (PDF)
- Pleatco 2023 Catalog — Unicel-to-Pleatco cross reference, PDF p.43 (PDF)
Not in sources: no Filbur equivalent sourced; no model-year range in source.
Full details & buy options →Hot Spot C-4326 cartridge (OEM 33521)
| OEM | 33521 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | — |
| Size | 4-15/16" × 13-5/16", 25 sq ft |
Sources
- Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.38; spec table PDF p.8 (PDF)
- Pleatco 2023 Catalog — Unicel-to-Pleatco cross reference, PDF p.43 (PDF)
Not in sources: no Filbur equivalent sourced; no model-year range in source.
Full details & buy options →Jacuzzi C-4326 cartridge (OEM 373045)
| OEM | 373045 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | — |
| Size | 4-15/16" × 13-5/16", 25 sq ft |
Sources
- Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.41; spec table PDF p.8 (PDF)
- Pleatco 2023 Catalog — Unicel-to-Pleatco cross reference, PDF p.43 (PDF)
Not in sources: no Filbur equivalent sourced; no model-year range in source.
Full details & buy options →