Discount Water Filters and Air Filters at Discount Filter Store.com

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Undersink Water Filters & Systems

Transform the water served from your tap or faucet into a premium quality beverage with an under sink water filter.

With over 250+ under sink water filter systems and undersink replacement filters available in a wide range of flow rates, colors/finishes, prices, and filter life’s, we’ve got an undersink filter for every home. Choose from some of the best under sink water filters including the Crystal Quest 7 Stage Under Sink Fluoride Water Filter System, the Culligan® Level-4 Easy Change Undersink Drinking Water System, and the 3M Filtrete™ Undersink Advanced Water Filter System.

Not sure, which under the sink water filter is right for your home? Give us a call 1-800-277-3458; our experts will help you choose the perfect under sink filter to address all of your water quality concerns, no matter how monumentous they may seem.

Note: All of our under sink filters and under sink water filter systems are backed by our 100% Price Match Guarantee. Meaning if you find a particular under sink water filter for less than our listed price, we’ll match the competitors lower price. Shopping for home water filters has never been easier.

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22 Item(s)

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  • PENTEK-QC10-CB1R

    PENTEK-QC10-CB1R

  • WGCHD American Plumber Undersink Water Filter Replacement Cartridge
  • CB6

    CB6

    $83.99
  • CQE-RC-04002 Crystal Quest PLUS Multi-Stage Replacement Filter Cartridge
  • GAC-20 Pentek Replacement Filter Cartridge

    GAC-20 Pentek Replacement Filter Cartridge

    $18.39
    MSRP: $29.99
    Save 39%
  • GAC-BB Pentek Replacement Filter Cartridge

    GAC-BB Pentek Replacement Filter Cartridge

    $26.59
    MSRP: $36.99
    Save 28%
  • PENTEK-QC10-CB1

    PENTEK-QC10-CB1

    $32.95
    MSRP: $40.99
    Save 20%
  • RS14-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)
  • RS2-SS OmniFilter Whole House Filter Replacement Cartridge

    RS2-SS OmniFilter Whole House Water Filter Cartridge

    $6.99
    MSRP: $8.04
    Save 13%
  • RS3SS

    RS3SS

  • RS7SS

    RS7SS

    $6.99
    MSRP: $8.38
    Save 17%
  • MATRIKX-1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge
  • CCBC-10 Pentek Undersink Filter Replacement Cartridge

    CCBC-10 Pentek Undersink Filter Replacement Cartridge

    $19.49
    MSRP: $27.99
    Save 30%
  • RS4-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)
  • BEVGUARD-BGE-3200

    BEVGUARD-BGE-3200

    $80.69
    MSRP: $83.33
    Save 3%
  • BEVGUARD-BGE-3200S

    BEVGUARD-BGE-3200S

    $90.09
    MSRP: $91.67
    Save 2%
  • BGE-4200S BevGuard Water Filter Cartridge

    BGE-4200S BevGuard Water Filter Cartridge

    $76.29
    MSRP: $94.99
    Save 20%
  • BGE-4200 BevGuard Water Filter Replacement Cartridge

    BGE-4200 BevGuard Water Filter Replacement Cartridge

    $63.59
    MSRP: $86.99
    Save 27%
  • CQE-RC-04003 Crystal Quest Multi Stage ULTRA Water Filter Cartridge
  • CQE-US-00313 Crystal Quest Undersink Double Ceramic PLUS Water Filtration System
  • CQE-US-00320 Crystal Quest Undersink Triple Arsenic PLUS Filtration System
  • CQE-US-00324 Crystal Quest Undersink Triple Nitrate PLUS Filtration System

22 Item(s)

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