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The Filters Fast® FF-0501 Replacement For Sta-Rite PTM 135, WC108-70S2X Pool and Spa Filter Cartridge is the compatible replacement for the Filters Fast® FF-0501. The FF-0501 is also the compatible replacement for the Filbur FC-2570. Designed with antimicrobial end caps to repel the presence of odor-causing bacteria and mold, the FF-0501 meets and/or exceeds compatible OEM pool filters in performance and longevity. The FF-0501 features a premium polyester media for strength and durability, while its sharp pleat folds has a high capacity for capturing dirt and other pesky particles. Along with its ability to prevent the build-up of bacteria and mold, the FF-0501 comes with wider support bands to increase water flow.
Filters Fast® FF-0501 Filter Specifications:
- Parts number: FF-0501
- Replaces Part number: FF-0501, FC-2570
- Weight: 4 oz.
- Area: 137 sq. ft.
- Top Style: 4 3/16" Open
- Dimensions: 8 11/16" x 31 1/4"
- Bottom Style: 4 3/16" Open Orange
The FF-0501 replaces the following water filters:
- Sta-Rite PTM 135
- Sta-Rite WC108-70S2X
- Unicel UHD-SR137
- Pleatco PSR137-4
- Aladdin 23701
Resources:
Specifications:
- Brand: FiltersFast
- Part Number: FF-0501
- Pack Size: 1
- Diameter: 8-11/16"
- Top: Open
- Bottom: 4-3/16"
- Product Weight: 4 oz
- Surface Area: 137 Sq. Ft.
- Length: 31-1/4"
Compatible Parts:
The Filters Fast® FF-0501 Replacement For Sta-Rite PTM 135, WC108-70S2X is the correct replacement for the following part numbers:

Customer Reviews:
This filter is an excellent quality product and fits and performs very well.
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