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PRT-115LOT spa filter equivalents
Part number PRT-115LOT 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.
Arctic Spas C-4950 cartridge, 4-15/16" (125 mm) × 13-5/16" (338 mm), 50 sq ft. Unicel C-4950, Pleatco PRB50-IN.
Unicel C-4950
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| OEM | PRT-115LOT |
|---|---|
| Unicel | C-4950 |
| Pleatco | PRB50-IN |
| Filbur | FC-2390 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 50 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference: Arctic Spas entry (PDF p.28, printed p.24) points to Blue Falls Mfg. Ltd. (Canada), PDF p.29 (printed p.25); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (C-4950 = PRB50-IN); Filbur prints this as PRB50-/-MIN (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Arctic Spas, printed p.27 (PDF p.14) (PDF)
- Arctic Spas Ontario (dealer): Filter 50 Pleated Drop-In: PRT-115LOT, 50 sq ft, = C-4950 / PRB50-IN / FC-2390, Arctic and most Coyote spas 2008 or earlier (web page)
Not in sources: factory part number from one Arctic dealer only; Arctic's owner's manual gives no part numbers; other dealers date the drop-in era 1998-2008 and exclude the Marmot model from the disposable drop-in.
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