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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Items 1 to 25 of 44 total

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  1. 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
  2. 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
  3. 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

  4. 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

  5. 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

  6. P5-D Culligan Comparable Whole House Filter Replacement Cartridge by Tier1 (2-Pack)

    P5-D Culligan Comparable Whole House Filter Replacement Cartridge by Tier1 (2-Pack)

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

    As Low As $3.99 Per Filter

  7. 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

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

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

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $0.00 Per Filter

  9. 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

  10. RS2DS OmniFilter Comparable Whole House Replacement Water Filter Cartridge by Tier1 (2-Pack)

    RS2DS OmniFilter Comparable Whole House Replacement Water Filter Cartridge by Tier1 (2-Pack)

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $0.00 Per Filter

  11. 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

  12. W5W American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

    W5W American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $0.00 Per Filter

  13. 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

  14. 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
  15. 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
  16. 750R-D Culligan Level 1 Undersink RV and Marine Icemaker and Drinking Water Filter

    750R-D Culligan Level 1 Undersink RV and Marine Icemaker and Drinking Water Filter

    Fits Culligan SY-750s, RV-750, IC-750, SY-1000, SY-1000s, RV-1000, and IC-1000 filter systems Learn More
    $18.49 MSRP:  $28.99
  17. D-10-TWIN Culligan Level 1 Undersink Filter Replacement Cartridge (2-Pack)

    D-10A Culligan Level 1 Undersink Filter Replacement Cartridge (2-Pack)

    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
    $13.99 MSRP:  $17.93
  18. D-15 Culligan Level 1 Undersink Filter Replacement Cartridge (2-Pack)

    D-15 Culligan Level 1 Undersink Filter Replacement Cartridge (2-Pack)

    Fits Culligan US-550, US-600, US-600A, RO-3000, RO-3500, RVF-10 and any brand of water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $19.59 MSRP:  $29.99
  19. D-20A Culligan Level 1 Undersink Water Filter Replacement Cartridge

    D-20A Culligan Level 1 Undersink Filter Replacement Cartridge

    Fits Culligan US-550, US-600, US-600A, RO-2127, RO-3000, RO-3500, and any brand of water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $15.39 MSRP:  $23.99
  20. D-250A Culligan Undersink Filter Replacement Cartridge Set

    D-250A Culligan Undersink Filter Replacement Cartridge Set

    Fits the Culligan SY-2300, SY-2300S and SY-2650 systems and any brand of undersink water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $31.99 MSRP:  $46.99
  21. D-28 Culligan Level 1 Undersink Filter Replacement Cartridge

    D-28 Culligan Level 1 Undersink Filter Replacement Cartridge

    Fits Culligan US-550, US-600, US-600A, and any brand of water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
  22. 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:  $36.99
  23. D-40 Culligan Level 4 Undersink Water Filter Replacement Cartridge

    D-40 Culligan Level 4 Undersink Water Filter Replacement Cartridge

    Fits Culligan US-550, US-600, US-600A, and any brand of water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $34.99 MSRP:  $50.99
  24. NCP-10 Culligan Whole House Filter Replacement Cartridge

    NCP-10 Culligan Whole House Filter Replacement Cartridge

    Fits any brand of whole house water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
  25. P1012581 Culligan Undersink Replacement Filter Cartridge

    P1012581 Culligan Undersink Replacement Filter Cartridge

    Fits the Culligan 201 Under Sink Water Filter System Learn More

Items 1 to 25 of 44 total

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