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. 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
  2. CMB-510-HF Advanced Water Products 10-inch x 4.5-inch Replacement Sediment Filter

    Advanced Water Products CMB-510-HF Whole House Filter for IHS12-D4 System

    Made for the Trojan UV Max IHS12-D4 Water Disinfection System Learn More
  3. D-25 Culligan Under Sink Water Filter

    D-25 Culligan Under Sink Water Filter

    Fits under sink filter systems that use 10 x 2.5-inch filters Learn More
  4. 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
  5. AP117 3M Aqua-Pure Comparable Whole House Sediment Water Filter by Tier1

    AP117 3M Aqua-Pure Comparable Whole House Sediment Water Filter by Tier1

    Fits most whole house water filter systems that uses standard 10 x 2-1/2 filter cartridges Learn More

    As Low As $0.00 Per Filter

  6. 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

  7. D-25 Culligan Comparable Undersink Replacement Cartridge by Tier1

    D-25 Culligan Comparable Undersink Replacement Cartridge by Tier1

    Fits standard 9 3/4-inch x 2 1/2-inch replacement filter cartridges. Learn More

    As Low As $0.00 Per Filter

  8. WCC American Plumber Comparable UndersinkReplacement Cartridge by Tier1

    WCC Amercian Plumber Comparable Undersink Replacement Cartridge by Tier1

    Fits standard 9 3/4-inch x 2 1/2-inch replacement filter cartridges. Learn More

    As Low As $0.00 Per Filter

  9. CC-10 Pentek Comparable Undersink Replacement Cartridge by Tier1

    CC-10 Pentek Comparable Undersink Replacement Cartridge by Tier1

    Fits standard 9 3/4-inch x 2 1/2-inch replacement filter cartridges. Learn More

    As Low As $0.00 Per Filter

  10. GAC1SS Omnifilter Comparable Undersink Replacement Cartridge by Tier1

    GAC1SS Omnifilter Comparable Undersink Replacement Cartridge by Tier1

    Fits standard 9 3/4-inch x 2 1/2-inch replacement filter cartridges. Learn More

    As Low As $0.00 Per Filter

  11. GAC-20 Pentek Comparable Granular Activated Carbon Water Filter by Tier1
  12. FXULC GE SmartWater Comparable Undersink Filter Replacement Cartridge by Tier1

    FXULC GE SmartWater Comparable Undersink Filter Replacement Cartridge by Tier1

    Fits standard sized housings that take 10 x 2-1/2 inch replacement filters Learn More

    As Low As $0.00 Per Filter

  13. R50-BBSA-D Culligan Comparable Whole House Water Filter by Tier1

    R50-BBSA-D Culligan Comparable Whole House Water Filter by Tier1

    Fits most standard 10 x 5-inch housings Learn More

    As Low As $0.00 Per Filter

  14. D-40 Culligan Comparable Undersink Water Filter Replacement Cartridge by Tier1

    D-40 Culligan Comparable Undersink Water Filter Replacement Cartridge by Tier1

    Fits standard sized housings that take 10 x 2-1/2 inch replacement filters Learn More

    As Low As $0.00 Per Filter

  15. CB1-SS6-S06 OmniFilter Comparable Undersink Water Filter Cartridge by Tier1

    CB1-SS6-S06 OmniFilter Comparable Undersink Water Filter Cartridge by Tier1

    Fits standard sized housings that take 10 x 2-1/2 inch replacement filters Learn More

    As Low As $0.00 Per Filter

  16. W30PE American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

    W30PE American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

    Fits American Plumber W34-PR, WC34-PR and WVC34 and most standard size water filter housings Learn More

    As Low As $12.99 Per Filter

  17. MAXETW-975 Watts Comparable C-MAX Replacement Water Filter Cartridge by Tier1

    MAXETW-975 Watts Comparable C-MAX Replacement Water Filter Cartridge by Tier1

    Fits into most industry standard 10-inch water filtration system housings Learn More

    As Low As $0.00 Per Filter

  18. CB3-SS6-06 OmniFilter Comparable Undersink Filter Replacement Cartridge by Tier1

    CB3-SS6-06 OmniFilter Comparable Undersink Filter Replacement Cartridge by Tier1

    Fits standard sized housings that take 10 x 2-1/2 inch replacement filters Learn More

    As Low As $0.00 Per Filter

  19. FXUTC GE SmartWater Comparable Undersink Filter Replacement Cartridge by Tier1

    FXUTC GE SmartWater Comparable Undersink Filter Replacement Cartridge by Tier1

    Fits standard sized housings that take 10 x 2-1/2 inch replacement filters Learn More

    As Low As $0.00 Per Filter

  20. AP420 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1(2-Pack)

    AP420 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1(2-Pack)

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $7.99 Per Filter

  21. WHKF-WHPL Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1 (2-Pack)

    WHKF-WHPL Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1 (2-Pack)

    Fits standard 2-1/2 inch by 10 inch filter housings Learn More

    As Low As $12.99 Per Filter

  22. DW-200-R American Plumber Undersink Filter Replacement Cartridge

    DW-200-R American Plumber Undersink Filter Replacement Cartridge

    Fits Cuno AP-200 and PurWater PW-200 housings Learn More
    $19.59 MSRP:  $26.99
  23. W385-PR American Plumber Undersink Compact Filter System
  24. W5CIP478 American Plumber Undersink Compact Filter Replacement Cartridge (2-Pack)

    W5CIP478 American Plumber Undersink Compact Filter Replacement Cartridge (2-Pack)

    Fits American Plumber W385-PR Learn More
    $16.99 MSRP:  $17.24
  25. WCC American Plumber Undersink Filter Replacement Cartridge

    WCC American Plumber Undersink Filter Replacement Cartridge

    Fits American Plumber W38-PR and most standard size water filter housings Learn More
    $19.99 MSRP:  $26.44

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