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. 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
  2. CMB-520-HF Advanced Water Products 20-inch x 4.5-inch Replacement Sediment Filter

    Advanced Water Products CMB-520-HF Whole House Filter for IHS22-D4 System

    Made for the Trojan UV Max IHS22-D4 Water Disinfection System Learn More
    $27.99 MSRP:  $39.97
  3. P-250 Pentek Comparable Under Sink Water Filter Set 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
    $21.99 MSRP:  $41.99
  4. 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

  5. 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

  6. 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

  7. 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

  8. W5CIP American Plumber Undersink Filter Replacement Cartridge (2-Pack)

    W5CIP American Plumber Undersink Filter Replacement Cartridge (2-Pack)

    Fits American Plumber W38-PR and most standard size water filter housings Learn More
    $21.99 MSRP:  $24.34
  9. 1000R-D Culligan Level 3 Undersink RV and Marine Icemaker and Drinking Water Filter

    1000R-D Culligan Level 3 Undersink RV and Marine Icemaker and Drinking Water Filter

    Fits Culligan SY1000, SY-1000s, IC-1000, RV-1000, SY-750s, IC-750, and RV-750 filter systems Learn More
    $29.79 MSRP:  $43.99
  10. D-30 Culligan Level 2 Undersink Filter Replacement Cartridge

    Culligan D-30 Level 2 Undersink Filter Replacement Cartridge

    Fits Culligan US-550, US-600, US-600A, SY-2000, SY-2100, and any brand of water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $25.69 MSRP:  $37.99
  11. P1012581 Culligan Undersink Replacement Filter Cartridge

    P1012581 Culligan Undersink Replacement Filter Cartridge

    Fits the Culligan 201 Under Sink Water Filter System Learn More
  12. SY-1000 Culligan Water Filtration System

    SY-1000 Culligan Water Filtration System

    Fits standard 1/4-inch water lines Learn More
  13. 3US-AF01 Filtrete Undersink Filter Replacement Cartridge

    3US-AF01 Filtrete Undersink Filter Replacement Cartridge

    Fits Filtrete 3US-AS01, 3US-PS01, and Whirlpool WHCF-SUF, WHCF-SUFC water filter systems Learn More
    $27.99 MSRP:  $28.99
  14. 4US-MAXS-F01 Filtrete Replacement Filter Cartridge

    4US-MAXS-F01 3M Filtrete Water Filter Cartridge

    Fits the 3M Filtrete High Performance Drinking water filtration system Learn More
  15. FXUTC GE SmartWater Undersink Filter Replacement Cartridge

    FXUTC GE SmartWater Undersink Filter Replacement Cartridge

    Fits any brand of undersink water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $23.69 MSRP:  $35.99
  16. 47-55712G2 Water Factory Systems Replacement Filter Cartridge

    47-9212G2 Water Factory Systems Replacement Filter Cartridge

    Fits 3M Cuno Water Factory FaucetMATE FM-2-CTO two-stage system Learn More
    $28.05 MSRP:  $51.28
  17. WHKF-DB1 Whirlpool Undersink Replacement Filter Cartridge

    WHKF-DB1 Whirlpool Undersink Replacement Filter Cartridge

    Fits the Whirlpool WHKF-DUF Under Sink Filter Housing Learn More
    $26.99
  18. MATRIKX-5-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge

    MATRIKX-5-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge

    Fits any standard housing that uses 9 3/4-inch x 2 1/2-inch replacement filter cartridges Learn More
  19. MATRIKX-Pb1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge

    MATRIKX-Pb1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge

    Fits any standard housing that uses 9 3/4-inch x 2 1/2-inch replacement filter cartridges Learn More
    $20.59 MSRP:  $28.99
  20. CQE-RC-04000 Crystal Quest Carbon Block Water Filter Cartridge

    CQE-RC-04000 Crystal Quest Carbon Block Water Filter Cartridge

    Fits Crystal Quest countertop, undersink and refrigerator water filtration systems Learn More
    $23.99 MSRP:  $28.74
  21. CQE-RC-04015 Crystal Quest Reusable Pleated Water Filter

    CQE-RC-04015 Crystal Quest Reusable Pleated Water Filter

    Fits Crystal Quest countertop, undersink and refrigerator water filtration systems Learn More
    $28.99 MSRP:  $35.99
  22. E5620 Omnipure E-Series Everpure Compatible Filter

    E5620 Omnipure E-Series Everpure Compatible Filter

    Fits Omnipure ELF Series and Everpure permanent filter heads including Insurice, H-100, H-50, OCS, OCS-2, QL-2, and QL-7 Learn More
    $20.09 MSRP:  $41.99
  23. 7012333 Sub-Zero UC-15I Undercounter Icemaker Comparable Replacement Water Filter by Tier1

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