Amazon.com : Ketofa PWW50 Filter for Compatible with Pleatco Spa Hot Tub Filter, PWW50P3 Spa Filter Compatible with Unicel 6CH-940 Filbur FC-0359 Waterways 817-0050 Front Access Skimmer Aber Hot Tubs(2 Pack) :
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Amazon.com : Lucasou Replacement for Spa Filter Unicel 6CH-940, PWW50 Filter for Compatible with Pleatco Spa Hot Tub Filter, Pleatco PWW50P3 Spa Filter for Filbur FC-0359, 2 Pack : Patio, Lawn & Garden
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SpiroPure Replacement for Pleatco PWW50 Hot Tub Spa $29.80
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Pleatco PWW50-XP4-M FOR SPA FROM PLEATCO PWW50-XP4-M FROM
Tier1 7-5/8 in. x 6 in. 80 sq. ft. Pool and Spa Filter Cartridge for Waterways 817-0050, PWW50, Filbur FC-0359 (2-Pack) TIER1_PAS_1617_2_PACK - The Home Depot