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 31 total

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  1. SPC-25-1030 Hydronix Pleated Sediment Water Filter

    SPC-25-1030 Hydronix Pleated Sediment Water Filter

    9 7/8 inches by 2.5 inches, 30 micron. Fits into systems that use American Plumber W30PE, Liquatec SPF-25-1030, Pentek 155017-43 and Pentek R30 water filters Learn More
    $9.99 MSRP:  $13.21
  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. RS14SS Comparable Sediment Water Filter by Tier1

    RS14SS Comparable Sediment Water Filter by Tier1

    Fits standard filter housings using 10 x 2.5-inch filters Learn More

    As Low As $3.90 Per Filter

  4. WPD-110 American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

    WPD-110 American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)

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

    As Low As $0.00 Per Filter

  5. 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

  6. AP124 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1

    AP124 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $0.00 Per Filter

  7. WP-5 Pentek Comparable Replacement Filter Cartridge by Tier1

    WP-5 Pentek Comparable Replacement Filter Cartridge by Tier1

    Fits most standard 10 x 2.5-inch filter housings 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. 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

  10. 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

  11. AP420 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1

    AP420 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1

    Fits most standard 10 x 2.5-inch housings Learn More

    As Low As $7.99 Per Filter

  12. WHKF-WHPL Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1

    WHKF-WHPL Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1

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

    As Low As $6.33 Per Filter

  13. SPC-25-1001 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    SPC-25-1001 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    1 micron filter, sized 9 7/8x2.5 inches Learn More

    As Low As $7.16 Per Filter

  14. SPC-25-1005 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    SPC-25-1005 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    9 7/8 inches by 2.5 inches, 5 micron. Fits into systems that use Liquatec SPF-25-1005, Pentek 255482-43 and Watts FM-5-975 water filters Learn More

    As Low As $7.16 Per Filter

  15. SPC-25-1020 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    SPC-25-1020 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    9 7/8 inches by 2.5 inches, 20 micron. Fits into filtration systems that use Liquatec SPF-25-1020, Pentek 255483-43 and Watts FM-20-975 water filters Learn More

    As Low As $6.33 Per Filter

  16. SPC-25-1030 Hydronix Comparable Pleated Sediment Water Filter by Tier1

    SPC-25-1030 Hydronix Comparable Pleated Sediment Water Filter by Tier1

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

    As Low As $6.33 Per Filter

  17. SWC-25-1020 Hydronix Comparable String Wound Sediment Water Filter by Tier1
  18. RWC-5 Culligan Comparable Whole House Water Filter by Tier1

    RWC-5 Culligan Comparable Whole House Water Filter by Tier1

    Fits most standard 10 x 2.5-inch filter housings Learn More

    As Low As $0.00 Per Filter

  19. OmniFilter RS12-SS6-05 Polypropylene Sediment Filter

    OmniFilter RS12-SS6-05 Polypropylene Sediment Filter

    Standard 10 inch by 2.5 inch size fits many common filter housings Learn More
    $4.99 MSRP:  $11.99
  20. EPM-10 Pentek Undersink Filter Replacement Cartridge

    EPM-10 Pentek Undersink Filter Replacement Cartridge

    Fits any standard housing that uses 9 3/4-inch x 2 1/2-inch replacement filter cartridges Learn More
    $9.99 MSRP:  $13.99
  21. P5-478 Pentek Undersink Filter Replacement Cartridge

    P5-478 Pentek Undersink Filter Replacement Cartridge

    Fits any standard housing that uses 5-inch x 2 1/2-inch replacement filter cartridges Learn More
    $6.99 MSRP:  $8.15
  22. R30-478 Pentek Undersink Filter Replacement Cartridge

    R30-478 Pentek Undersink Filter Replacement Cartridge

    Fits Pentek housings that use compact 4 7/8-inch x 2 5/8-inch replacement filter cartridges Learn More
    $8.99 MSRP:  $12.75
  23. RS14-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)

    RS14-DS OmniFilter Whole House Water Filter Cartridges (2-Pack)

    Fits any brand of whole house water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $6.99 MSRP:  $8.15
  24. RS2-SS OmniFilter Whole House Filter Replacement Cartridge

    RS2-SS OmniFilter Whole House Water Filter Cartridge

    Fits any brand of whole house water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    $6.99 MSRP:  $8.04
  25. RS3-SS OmniFilter Whole House Filter Replacement Cartridge

    RS3-SS OmniFilter Replacement Whole House Water Filter Cartridge

    Fits any brand of whole house water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More

Items 1 to 25 of 31 total

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