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Replacement Water Filters: Undersink

Don’t settle for a replacement under sink water filter cartridge that simply fits, find one designed and manufactured specifically for your under sink water filter system.

Discount Filter Store has one of the largest selections of undersink filter cartridges. With under sink filter cartridges available in over 15+ different filter medias, 8+ different sizes (5x2½ - 20x4½), and a wide variety of filter life’s ranging from 250 gallons to 50,000+ gallons, you’re guaranteed to find the under sink water filter system and/or replacement cartridges you need. Choose from hundreds of under sink water filter cartridges from some of the industry’s top brands including American Plumber, Crystal Quest, Pentek®, Culligan®, GE, Aqua-Pure®, Whirlpool®, and more.

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  1. RC-0.5 Rainshow’r Replacement Water Filter

    RC-0.5 Rainshow’r Replacement Water Filter

    Fits into the C-200 Condor or BT-300 Breakthrough water filtration systems by Rainshow'r Learn More
    $92.99 Retail Price:  $115.00
  2. WFDWC70001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC70001 DuPont Universal Drinking Water Carbon Block Cartridge

    Fits WFDW120009W DuPont Universal Drinking Water Filter System and other brands of 10-inch standard-size filter systems Learn More
  3. W9123085 Doulton Imperial UltraCarb Undersink Ceramic Candle Replacement Filter Cartridge

    W9123085 Doulton Imperial UltraCarb Undersink Ceramic Candle Replacement Filter Cartridge

    Fits all Doulton short mount Countertop, Undersink and Inline Systems Learn More
    $65.99 Retail Price:  $109.65
  4. W9121750 Doulton Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge

    W9121750 Doulton Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge

    Fits Doulton HIP, HIS and HCPS housings (NOT gravity-fed) Learn More
    $36.99 Retail Price:  $41.50
  5. W9121715 Doulton Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge

    W9121715 Doulton Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge

    Fits Doulton gravity fed systems Learn More
    $36.99 Retail Price:  $41.41

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