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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  1. 36005 Hydrologic SmallBoy De-Chlorinator and Sediment Filter System With Upgraded KDF
  2. P-12 Under Sink Water Replacement Filter Cartridge by Tier1
  3. WFDW120009W DuPont Universal Drinking Water Filter System

    WFDW120009W DuPont Universal Drinking Water Filter System

    Fits DuPont WFDW 2000 series, 4000 series, 7000 series Learn More
  4. 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
    $33.99 MSRP:  $45.85
  5. WFDWC20001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC20001 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
  6. WFDWC40001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC40001 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
  7. WFHDC8001 DuPont Universal Heavy Duty Carbon Wrap 2-Phase Cartridge

    WFHDC8001 DuPont Universal Heavy Duty Carbon Wrap 2-Phase Cartridge

    Fits WFHD13001B Universal Heavy Duty Whole House Filtration System and other brands of 10x4.5-inch filter systems Learn More
    $25.99 MSRP:  $32.92
  8. C2-02 Advanced Water Products 20-inch x 4.5-inch Replacement Carbon Whole House Filter

    C2-02 Advanced Water Products Replacement 20-inch x 4.5-inch Carbon Whole House Filter

    Fits most 20-inch x 4.5-inch filter housings, including the Trojan UV Max IHS12-D4 and IHS22-D4 Water Disinfection Systems Learn More
  9. CB1-10 Pentek Carbon Block Water Filter Replacement

    CB1-10 Pentek Carbon Block Water Filter Replacement

    Fits most standard 10-inch x 2.5-inch housings Learn More
    $15.39 MSRP:  $23.99
  10. KX Matrikx CTO2-12 Reverse Osmosis Carbon Block Replacement Filter

    KX Matrikx CTO2-12 Reverse Osmosis Carbon Block Replacement Filter

    Fits Culligan AC15, AC30, LC50, and H83 Reverse Osmosis systems Learn More
    $7.19 MSRP:  $13.99
  11. D-250A Culligan Comparable Under Sink Water Filter Set by Tier1

    D-250A Culligan Comparable Under Sink Water Filter Set by Tier1

    Fits various brands of under-sink housings, including Culligan, Pentek, Ametek and American Plumber Learn More

    As Low As $0.00 Per Filter

  12. P-250 Pentek Comparable Under Sink Water Filter Set by Tier1

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

    Fits various brands of under-sink housings, including Culligan, Pentek, Ametek and American Plumber Learn More

    As Low As $0.00 Per Filter

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

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

    Fits various brands of under-sink housings, including Culligan, Pentek, Ametek and American Plumber Learn More

    As Low As $0.00 Per Filter

  14. WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1

    WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1

    Fits various brands of under-sink housings, including Culligan, Pentek, Ametek and American Plumber Learn More

    As Low As $0.00 Per Filter

  15. WHKF-DB2 Whirlpool Comparable Under Sink Water Filter by Tier1

    WHKF-DB2 Whirlpool Comparable Under Sink Water Filter by Tier1

    Fits various brands of under-sink housings, including Culligan, Pentek, Ametek and American Plumber Learn More

    As Low As $0.00 Per Filter

  16. FQSVF / FQSLF GE SmartWater Undersink Water Filter Replacement Cartridge Set By Tier1

    FQSVF / FQSLF GE SmartWater Undersink Water Filter Replacement Cartridge Set By Tier1

    Fits GE SmartWater undersink filter systems Learn More
    $36.99 MSRP:  $83.99
  17. FQK2J GE SmartWater Undersink Water Filter Replacement Cartridge Set by Tier1

    FQK2J GE SmartWater Undersink Water Filter Replacement Cartridge Set by Tier1

    Fits GE SmartWater undersink filter systems Learn More

    As Low As $0.00 Per Filter

  18. FQK2J GE Undersink Water Filter Set

    FQK2J GE Undersink Water Filter Set

    Fits GE SmartWater undersink filter systems Learn More
    $49.98 MSRP:  $49.99
  19. Pentek QC10-CB1R Carbon Block Quick Change Filter

    Pentek QC10-CB1R Carbon Block Quick Change Filter

    Proprietary design fits Pentek QC systems exclusively Learn More
  20. 4373529 Whirlpool Undersink Filter Replacement Cartridge

    4373529 Whirlpool Undersink Filter Replacement Cartridge

    Fits Whirlpool WSC100 filter system Learn More
  21. 600R American Plumber Undersink Filter Replacement Cartridge

    600R American Plumber Undersink Water Filter Cartridge

    Built to fit into American Plumber WIC-600 and DW-600 undersink water filtration systems Learn More
    $31.99 MSRP:  $35.06
  22. DW-2000-RB American Plumber Replacement Filter Cartridge

    DW-2000-RB American Plumber Replacement Filter Cartridge

    Fits American Plumber DW-1200, DW-2000 and select Culligan systems Learn More
    $59.99 MSRP:  $61.28
  23. WI-BG12000C Body Glove Replacement Filter Cartridge

    WI-BG12000C Body Glove Replacement Filter Cartridge

    Fits the Body Glove BG-12000 Water Filter System Learn More
    $290.21 MSRP:  $386.95
  24. WI-BG3000C Body Glove Replacement Filter Cartridge

    WI-BG3000C Body Glove Replacement Filter Cartridge

    Fits the Body Glove BG-3000 Water Filter System Learn More
    $158.99 MSRP:  $192.95
  25. WI-BG3000R Body Glove Replacement Filter Cartridge

    WI-BG3000R Body Glove Replacement Filter Cartridge

    Fits existing Everpure C-300 Filtration Systems Learn More
    $145.99 MSRP:  $174.95

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