Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

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Watkins (Hot Springs)

Watkins - Hot Springs ®* Compatible Pool Replacement Water Filters
  1. Harmsco ® H-4326-AM Antimicrobial Replacement Water Filter Cartridge
    Harmsco ® H-4326-AM Antimicrobial Replacement Water Filter Cartridge
    Harmsco ® H-4326-AM Antimicrobial Replacement Pool Water Filter Cartridge - Step up to Premium Antimicrobial Construction. Cross reference RA25TC-3, Unicel C-4625 - C-4326, Pleatco PRB 25-IN, Filbur FC 4375 - FC 2375. 13 3/8 inches height x 4 15/16 inches diameter. Learn More
    $37.99 Special Price $26.99 As low as $23.99
  2. Harmsco ® H-6430 Replacement Water Filter Cartridge
    Harmsco ® H-6430 Replacement Water Filter Cartridge
    Harmsco ® H-6430 Replacement Spa Water Filter Cartridge - Replaces WA30TC-3, C-6430 & PWK30. Watkins 30 sq.ft. Fits all models starting from 1991. 10 1/2" height X 6" diameter. Learn More
    $36.99 Special Price $24.99 As low as $22.99
  3. Pool and Spa Bacteria Tests
    Pool and Spa Bacteria Tests
    2 Pool And Spa Bacteria Tests Per Package. Easy to use. Do it yourself. Results in 20 minutes. Test for harmful bacteria for safety. Learn More
    $22.99 Special Price $15.99 As low as $12.99
Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.