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-3963 spa filter equivalents
Part number FC-3963 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.
Hot Spot C-7350 cartridge (OEM 1019401), 7" (178 mm) × 10-3/4" (273 mm), 50 sq ft. Unicel C-7350, Pleatco PCD50N.
Unicel C-7350
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| OEM | 1019401 |
|---|---|
| Unicel | C-7350 |
| Pleatco | PCD50N |
| Filbur | FC-3963 |
| Size | 7" (178 mm) × 10-3/4" (273 mm), 50 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Springs Spas section), PDF p.30 (printed p.26); spec table PDF p.15 (printed p.11) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Caldera, printed p.30 (PDF p.16) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Hot Spot spa filters · Which fitting you need · How to install it
Caldera C-7350 cartridge (OEM 1019401), 7" (178 mm) × 10-3/4" (273 mm), 50 sq ft. Unicel C-7350, Pleatco PCD50N.
Unicel C-7350 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 | 1019401 |
|---|---|
| Unicel | C-7350 |
| Pleatco | PCD50N |
| Filbur | FC-3963 |
| Size | 7" (178 mm) × 10-3/4" (273 mm), 50 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Caldera section), PDF p.30 (printed p.26); spec table PDF p.15 (printed p.11) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Caldera, printed p.30 (PDF p.16) (PDF)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
- Leisure Time Inc. (Hot Spring/Caldera dealer): Compatibility section: model and model-year list (web page)
Full details → · All Caldera spa filters · Which fitting you need · How to install it