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C-6600 spa filter equivalents
Part number C-6600 appears in 1 cited cross-reference row 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-6600 cartridge (OEM 31115)
| OEM | 31115 |
|---|---|
| Unicel | C-6600 |
| Pleatco | — |
| Filbur | — |
| Size | 6-3/8" × 11-7/8", 45 sq ft |
⚠ Unverified / possible conflict: this row has not been fully confirmed against a second source. Gaps: no Pleatco equivalent found in Pleatco 2023 xref p.43; no Filbur equivalent sourced; no model-year range in source. Measure your old cartridge before ordering.
Sources
- Unicel 2026 Replacement Guide — OEM Cross Reference, PDF p.38; spec table PDF p.12 (PDF)