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

When we protect your filter purchase with our No Worries Guarantee, we mean it!

No Worries...
  • Your filters are guaranteed to be the right fit!
  • Our products are price match guaranteed!
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  • You’re guaranteed to find expert help!

Learn more about our No Worries Guarantee

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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  • F-201R InSinkErator Instant Hot Water Dispenser Replacement Filter Cartridge (2-Pack)
  • F-601R InSinkErator Instant Hot Water Dispenser Replacement Filter Cartridge (2-Pack)
  • 8014931 Katadyn Vario Backcountry Series Microfilter Water Filter
  • Everpure H-54 Water Filter Replacement Cartridge (EV9730-06)
  • FXWTC GE Comparable Whole House Water Filter 2-Pack by Tier1
  • 3M Aqua-Pure APDWS1000 Undersink Water Filter System

    APDWS1000 Undersink Water Filter System by 3M Aqua-Pure

    $405.29
    MSRP: $547.99
    Save 26%
  • WFDW120009W DuPont Universal Drinking Water Filter System
  • WFDWC70001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFDWC20001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFDWC40001 DuPont Universal Drinking Water Carbon Block Cartridge
  • DUPONT-WFQTC90001
  • R200 Samsung Inline Water Filter Replacement by Tier1

    R200 OmniFilter Inline Water Filter Replacement by Tier1

    $6.99 MSRP: $10.34
    Save 32%
  • CB6 Multipure Aquaversa Comparable Water Filter: HDG-CB6-14 HydroGuard

    CB6 Comparable Water Filter: HDG-CB6-14 HydroGuard

    $30.79
    MSRP: $45.99
    Save 33%
  • NCP-BB Pentek Whole House Water Filter

    NCP-BB Pentek Whole House Filter Replacement Cartridge

    $32.99 MSRP: $36.34
    Save 9%
  • W5CIP American Plumber Whole House Carbon Water Filter by Tier1
  • D-10 Twin Culligan Comparable Whole House Carbon Water Filter by Tier1
  • D-15 Culligan Whole Comparable House Carbon Water Filter by Tier1
  • WH-STDCW-F02 Filtrete Comparable Whole House Carbon Filter by Tier1
  • TO1DS OMNIFILTER Comparable Whole House Carbon Water Filter by Tier1 (2-Pack)
  • C1 Pentek Comparable Whole House Carbon Water Filter by Tier1
  • D-250A Culligan Comparable Under Sink Water Filter Set by Tier1
  • P-250 Pentek Comparable Under Sink Water Filter Set by Tier1
  • P-250A Pentek Comparable Under Sink Filter Set by Tier1

    P-250A Pentek Comparable Under Sink Filter Set by Tier1

    $24.99 MSRP: $41.99
    Save 40%
  • WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1
  • WHKF-DB2 Whirlpool Comparable Under Sink Water Filter by Tier1
  • W9123053 Doulton UltraCarb Undersink Ceramic Candle Replacement Filter Cartridge
  • 600R American Plumber Undersink Filter Replacement Cartridge

    600R American Plumber Undersink Water Filter Cartridge

    $31.99
    MSRP: $35.06
    Save 9%
  • WCC American Plumber Undersink Filter Replacement Cartridge

    WCC American Plumber Undersink Filter Replacement Cartridge

    $19.99
    MSRP: $26.44
    Save 24%
  • WGC478 American Plumber Undersink Compact Filter Replacement Cartridge
  • WIC-600 American Plumber Undersink Filter System

    WIC-600 American Plumber Undersink Filter System

    $55.99
    MSRP: $58.34
    Save 4%
  • 3M Aqua-Pure AP-C78 Water Filter Replacement Cartridge
  • AP-DW80/90 3M Aqua-Pure Water Filter Set

    AP-DW80/90 3M Aqua-Pure Pre and Post Filter Set

    $116.99
    MSRP: $173.90
    Save 33%
  • 3M Aqua-Pure APIL3R Inline Water Filter
  • C-COMPLETE 3M Aqua-Pure Undersink Water Filter

    C-COMPLETE 3M Aqua-Pure Undersink Water Filter Cartridge

    $68.79
    MSRP: $92.99
    Save 26%
  • C-CS-S 3M Aqua-Pure Undersink Water Filter

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

    $37.39
    MSRP: $50.99
    Save 27%
  • C-LC 3M Aqua-Pure Undersink Water Filter

    C-LC 3M Aqua-Pure Undersink Water Filter Cartridge

    $50.99
    MSRP: $65.54
    Save 22%
  • CQE-RC-04049 Crystal Quest Fluoride Multi Replacement Filter Cartridge
  • 01013029 Culligan Reverse Osmosis Filter Cartridge
  • 1000R-D Culligan Level 3 Undersink RV and Marine Icemaker and Drinking Water Filter
  • D-250A Culligan Undersink Filter Replacement Cartridge Set

    D-250A Culligan Undersink Filter Replacement Cartridge Set

    $31.89
    MSRP: $46.99
    Save 32%
  • D-40 Culligan Level 4 Undersink Water Filter Replacement Cartridge
  • IC-1000 Culligan Inline Filter
  • IC-EZ-3 Culligan Level 3 Easy-Change Inline Filter System

    IC-EZ-3 Culligan Level 3 Easy-Change Inline Filter System

    $34.99
    MSRP: $53.99
    Save 35%
  • IC-EZ-4 Culligan Level 4 Easy-Change Inline Filter System

    IC-EZ-4 Culligan Level 4 Easy-Change Inline Filter System

    $56.99
    MSRP: $71.29
    Save 20%
  • RC-EZ-3 Culligan Level 3 Easy-Change Inline Filter Replacement Cartridge
  • RC-EZ-4 Culligan Level 4 Easy-Change Inline Filter Replacement Cartridge
  • RV-EZ-3 Culligan Level 3 Easy-Change RV Inline Filter System
  • SY-1000 Culligan Water Filtration System

Items 1 to 48 of 124 total

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