Reverse Osmosis System Filters, RO Membranes and Parts

Softening Cartridges

Water Softener Replacement Filter Cartridges
  1. Pentek WS-10 # 155319 Water Softening Replacement Filter Cartridge
    Pentek WS-10 # 155319 Water Softening Replacement Filter Cartridge
    Pentek WS-10 # 155319 Water Softening Replacement Filter Cartridge Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. Fits in standard 10" water filter housings to provide soft water. Order a case of 6 and save even more.
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    $28.99 Special Price $19.99 As low as $16.99
  2. Pentek WS-20 #155320 WS20 Water Softening Replacement Soft Water Filter Cartridge
    Pentek WS-20 #155320 WS20 Water Softening Replacement Soft Water Filter Cartridge
    Pentek WS-20 #155320 WS20 Water Softening Replacement Soft Water Filter Cartridge Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. 20 inches long. Fits standard 20" filter housings to provide soft water. Order a case of 6 and save even more.
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    $39.99 Special Price $29.99 As low as $25.99
  3. Pentek WS-20BB #155321 WS20BB Water Softening Big Blue Replacement Soft Water Filter Cartridge
    Pentek WS-20BB #155321 WS20BB Water Softening Big Blue Replacement Soft Water Filter Cartridge
    Pentek WS-20BB #155321 WS20BB Water Softening Big Blue Replacement Soft Water Filter Cartridge Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. Get soft water using your standard Big Blue water filter housing. Water Softening Filter Cartridge #155321 20" for Big Blue Filter Housings. Order a case of 6 and save even more.
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    $64.99 Special Price $52.99 As low as $45.99
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.