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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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  • 4373529 Whirlpool Undersink Filter Replacement Cartridge

    4373529 Whirlpool Undersink Filter Replacement Cartridge

    $43.99 Retail Price:  $50.59
  • 3M Aqua-Pure AP-DW70 Undersink Filter Replacement Cartridge
  • C-CS-FF 3M Aqua-Pure Undersink Water Filter

    C-CS-FF 3M Aqua-Pure Undersink Water Filter Cartridge

    $43.99 Retail Price:  $48.06
  • CQE-RC-04002 Crystal Quest PLUS Multi-Stage Replacement Filter Cartridge
  • GXULQR GE Undersink Water Filter Replacement Cartridge
  • PCC-1 Pentek Undersink Filter Replacement Cartridge

    PCC-1 Pentek Undersink Filter Replacement Cartridge

    $41.99 Retail Price:  $53.23
  • 47-55708G2 Water Factory Systems Replacement Filter Cartridge
  • Whirlpool WHAB-6010 Replacement Unit B Filter Cartridge

    WHAB-6010 Whirlpool Replacement Unit B Filter Cartridge

    $48.99 Retail Price:  $62.09
  • MATRIKX-Pb1-HD10 KX Technologies MatrikX Undersink Filter Replacement Cartridge
  • RS4-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)
  • W9222910 Doulton Replacement Ceramic Filter

    W9222910 Doulton Supercarb Replacement Ceramic Filter

    $43.85 Retail Price:  $52.73
  • WHEEDF Whirlpool UltraEase Water Filter Pack

    WHEEDF Whirlpool UltraEase Water Filter Pack

    $47.99 Retail Price:  $59.79
  • CQE-RC-04006 Crystal Quest Fluoride Water Filter

    CQE-RC-04006 Crystal Quest Fluoride Water Filter

    $47.99 Retail Price:  $63.24
  • CQE-RC-04036 Crystal Quest Carbon Block Water Filter Cartridge
  • P-12 Under Sink Water Replacement Filter Cartridge by Tier1

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