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

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  • Our products are price match guaranteed!
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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.

Items 1 to 25 of 28 total

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  1. AQUA-PURE-APDWS1000

    AQUA-PURE-APDWS1000

    $394.99
  2. AQUAPURE-AP327

    AQUAPURE-AP327

    $37.99
  3. AMERICAN-PLUMBER-W5CIP
  4. AQUAPURE-AP200

    AQUAPURE-AP200

    Regular Price: $104.99

    Special Price: $87.05

  5. AQUAPURE-AP217

    AQUAPURE-AP217

    $36.99
  6. AQUAPURE-AP22

    AQUAPURE-AP22

    $56.05 MSRP:  $75.89
  7. AQUAPURE-AP-250R

    AQUAPURE-AP-250R

    $29.99 MSRP:  $41.39
  8. AQUAPURE-AP317

    AQUAPURE-AP317

    $52.99 MSRP:  $66.69
  9. AQUA-PURE-AP410

    AQUA-PURE-AP410

    $64.99 MSRP:  $71.29
  10. AQUAPURE-AP517

    AQUAPURE-AP517

    $66.99 MSRP:  $70.14
  11. 3M Aqua-Pure AP-C77 Undersink Filter Replacement Cartridge

    AP-C77 3M Aqua-Pure Undersink Filter Replacement Cartridge

    Fits 3M Aqua-Pure undersink water filter systems Learn More
  12. 3M Aqua-Pure AP-C78 Water Filter Replacement Cartridge

    AP-C78 3M Aqua-Pure Undersink Filter Replacement Cartridge

    Fits 3M Aqua-Pure undersink water filter systems Learn More
  13. AQUAPURE-AP-DW70

    AQUAPURE-AP-DW70

    $47.99 MSRP:  $56.34
  14. AQUAPURE-AP-DW80-90

    AQUAPURE-AP-DW80-90

    $116.99 MSRP:  $137.99
  15. AQUAPURE-AP-DW85

    AQUAPURE-AP-DW85

    $54.99 MSRP:  $55.19
  16. AQUAPURE-C-COMPLETE

    AQUAPURE-C-COMPLETE

    $66.99 MSRP:  $88.54
  17. AQUAPURE-C-CS-FF

    AQUAPURE-C-CS-FF

    $43.99 MSRP:  $48.06
  18. AQUAPURE-C-CS-S

    AQUAPURE-C-CS-S

    $37.99 MSRP:  $42.54
  19. AQUAPURE-C-CYST-FF

    AQUAPURE-C-CYST-FF

    $52.99 MSRP:  $56.34
  20. AQUAPURE-C-LC

    AQUAPURE-C-LC

    $50.99 MSRP:  $65.54
  21. AQUA-PURE-EP35R

    AQUA-PURE-EP35R

    $115.99 MSRP:  $123.04
  22. GAC-20 Pentek Replacement Filter Cartridge

    GAC-20 Pentek Replacement Filter Cartridge

    Fits most housings that accept standard 20-inch x 2.5-inch water filter cartridges Learn More
    $17.99 MSRP:  $23.56
  23. GAC-BB Pentek Replacement Filter Cartridge

    GAC-BB Pentek Replacement Filter Cartridge

    Fits most Big Blue housings that accept 10-inch x 4.5-inch water filter cartridges Learn More
    $25.99 MSRP:  $30.51
  24. AQUA-PURE-AP510

    AQUA-PURE-AP510

    $141.99
  25. AQUA-PURE-3MFF101

    AQUA-PURE-3MFF101

    $200.99

Items 1 to 25 of 28 total

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