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6CH-975 spa filter equivalents
Part number 6CH-975 appears in 1 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.
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.
Cal Spas 6CH-975 cartridge (OEM FIL11700016), 6-3/4" (171 mm) × 15-1/2" (394 mm), 75 sq ft. Unicel 6CH-975, Pleatco not listed.
Unicel 6CH-975
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| OEM | FIL11700016 |
|---|---|
| Unicel | 6CH-975 |
| Pleatco | not listed |
| Filbur | not listed |
| Size | 6-3/4" (171 mm) × 15-1/2" (394 mm), 75 sq ft |
Unverified. This row has not been fully confirmed against a second source. Gaps: no Pleatco equivalent in Pleatco 2023 cross reference; no Filbur equivalent found in Filbur catalog; no model/model-year fitment in sources Checked 2026-11-03: ezhottubparts still crosses FIL11700016 to Unicel 6CH-960 (52 sq ft); a Spa Parts Warehouse listing for FIL75-7D155H2MCT-3 / FIL11700016 gives 75 sq ft, 7" x 15", 2" MPT, which matches 6CH-975's area but neither catalog's thread wording. Checked 2026-11-04: Unicel's Cal Spas section still prints FIL11700016 as 6CH-975 (6-3/4" x 15-1/2", 2" SAE, 75 sq ft). A search of the Filbur catalog the same day found no FIL11700016. Unresolved. Checked 2026-11-06: Unicel PDF p.30 (printed p.26) still prints FIL11700016 as 6CH-975, 6-3/4" x 15-1/2", 2" SAE, 75 sq ft. No new manufacturer model chart and no Filbur row for FIL11700016. Checked 2026-11-07: Unicel’s Cal Spas line still prints FIL11700016 as 6CH-975, 6-3/4" × 15-1/2", 2" SAE, 75 sq ft. No model-to-cartridge chart was found. Still unresolved. Checked 2026-11-08: Unicel PDF p.30 still prints FIL11700016 as 6CH-975, 6-3/4" x 15-1/2", 2" SAE, 75 sq ft. A text search of the Pleatco 2023 PDF and the Filbur PDF found no 6CH-975 and no FIL11700016. Still unresolved.. Measure your old cartridge before ordering.
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Cal Spas section), PDF p.30 (printed p.26); spec table PDF p.13 (printed p.9) (PDF)
- Spa Parts Warehouse (retailer listing): Replacement for FIL75-7D155H2MCT-3 / FIL11700016 (fetched via search 2026-11-03): 7" diameter, 15" length, 2" MPT, 75 sq ft (web page)
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