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

When we protect your filter purchase with our No Worries Guarantee, we mean it!

No Worries...
  • Your filters are guaranteed to be the right fit!
  • Our products are price match guaranteed!
  • Our customer service team is guaranteed to answer your call!
  • You’re guaranteed to find expert help!

Learn more about our No Worries Guarantee

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.

Clear All
Compare

Items 1 to 25 of 88 total

Page:
  1. 1
  2. 2
  3. 3
  4. 4

Grid  List 

Set Descending Direction
  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. 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
  3. NFS-AQUAPURE-AP117

    NFS-AQUAPURE-AP117

    As Low As $0.00 Per Filter

  4. NFS-PENTEK-P-250

    NFS-PENTEK-P-250

    As Low As $0.00 Per Filter

  5. NFS-PENTEK-P-250A

    NFS-PENTEK-P-250A

    As Low As $0.00 Per Filter

  6. NFS-WHIRLPOOL-WHKF-DB1

    NFS-WHIRLPOOL-WHKF-DB1

    As Low As $0.00 Per Filter

  7. NFS-WHIRLPOOL-WHKF-DB2

    NFS-WHIRLPOOL-WHKF-DB2

    As Low As $0.00 Per Filter

  8. NFS-AMERICAN-PLUMBER-WRC25HD20

    NFS-AMERICAN-PLUMBER-WRC25HD20

    As Low As $0.00 Per Filter

  9. NFS-PENTEK-GAC20-BB

    NFS-PENTEK-GAC20-BB

    As Low As $0.00 Per Filter

  10. NFS-AQUAPURE-AP817-2

    NFS-AQUAPURE-AP817-2

    As Low As $0.00 Per Filter

  11. NFS-PENTEK-RFC20-BB

    NFS-PENTEK-RFC20-BB

    As Low As $0.00 Per Filter

  12. NFS-FILTREX-FXB20RFL

    NFS-FILTREX-FXB20RFL

    As Low As $0.00 Per Filter

  13. NFS-FXULC

    NFS-FXULC

    As Low As $0.00 Per Filter

  14. RFC-93 Whole House Filter Replacement Cartridge by Tier1

    RFC-93 Whole House Filter Replacement Cartridge by Tier1

    Fits most 10x2.5 housings Learn More
    $17.99
  15. 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

  16. NFS-CULLIGAN-R50-BBSA-D

    NFS-CULLIGAN-R50-BBSA-D

    As Low As $0.00 Per Filter

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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 $6.33 Per Filter

  25. 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

Items 1 to 25 of 88 total

Page:
  1. 1
  2. 2
  3. 3
  4. 4

Grid  List 

Set Descending Direction
Scroll To Top