Filters Fast® Replacement for Filbur FC-3921, PWK35B Pool & Spa Filter

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Keep the water in your hot tub or spa sparkling clean with the help of the Filters Fast® FF-3921 Pool & Spa Filter Cartridge. Designed for long-lasting use, this high-quality spa filter cartridge features spun-bond trilobal filter media that will keep dirt, debris, and more from creeping its way in. Plus, it's easy to clean and reuse multiple times before it needs to be replaced. This filter is a compatible replacement for Limelight and Watkins Spas that use Filbur FC-3921, 2018 + model Pulse, Flash, Flair, Prism, and Beam 78161.

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Specifications:

• Brand: Filters Fast®
• Part Number: FF-3921
• Pack Size: 1
• Filter Life (Months): 6 to 12
• Diameter: 6-3/8”
• Top: 1-15/16” Open
• Bottom: 1-15/16” Open
• Surface Area: 35 Sq. Ft.
• Length: 14”