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. W9222900 Doulton Ceramic Water Filter

    W9222900 Doulton Slim Line SuperCarb Undersink Ceramic Water Filter

    Fits Doulton Short Mount Countertop, Undersink and Inline Water Filtration Systems Learn More
    $34.00 MSRP:  $52.73
  2. Aqua-Pure 3M Easy Full Flow Drinking Water Filtration System CYST-FF
  3. P-12 Under Sink Water Replacement Filter Cartridge by Tier1
  4. Pentek SCBC-10 Silvered Carbon Block

    Pentek SCBC-10 Silvered Carbon Block

    Standard 10 inch by 2.5 inch size fits many under sink filter housings Learn More
    $22.99 MSRP:  $24.71
  5. WFDWC70001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC70001 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
    $33.99 MSRP:  $45.85
  6. BF7-S-06 OmniFilter Undersink Filter System
  7. 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
  8. FQSVF GE SmartWater Undersink Water Filter Replacement Cartridge Set By Tier1

    FQSVF GE SmartWater Undersink Water Filter Replacement Cartridge Set By Tier1

    Fits GE SmartWater undersink filter systems Learn More
    $36.99 MSRP:  $83.99
  9. FQK2J GE Undersink Water Filter Set

    FQK2J GE Undersink Water Filter Set

    Fits GE SmartWater undersink filter systems Learn More
    $49.98 MSRP:  $49.99
  10. W9222903 Doulton Ceramic Supercarb M15 Replacement Undersink Cartridge
  11. W9380040 Doulton Two Stage Duo Undersink Drinking Water System

    W9380040 Doulton Two Stage Duo Undersink Drinking Water System

    Fits Doulton brand 10 x 2 -inch filters. Complete with UltraCarb W9123006 and the Fluoride W9125030. Learn More
    $136.00 MSRP:  $161.99
  12. 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System and Faucet by Tier1

    4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System by Tier1 (Quick Change)

    Installs directly onto the cold water supply Learn More
    $129.99 MSRP:  $155.00
  13. US-UF-100-CBRF 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Carbon Filter by Tier1

    US-UF-100-CBRF 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Carbon Filter by Tier1

    Fits the 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System by Tier1 Learn More
    $19.99 MSRP:  $59.99
  14. US-UF-100-SDRF-1 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Sediment Filter by Tier1 (1 Micron)

    US-UF-100-SDRF-1 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Sediment Filter by Tier1 (1 Micron)

    Fits the 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System by Tier1 Learn More
    $14.99 MSRP:  $47.99
  15. US-UF-100-RM 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Membrane by Tier1

    US-UF-100-RM 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacement Membrane by Tier1

    Fits the 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System by Tier1 Learn More
    $39.99 MSRP:  $69.99
  16. US-ST04 Tier1 Undersink Smart Tap System

    US-ST04 Tier1 Undersink Smart Tap System

    $59.99 MSRP:  $95.99
  17. 4-Stage Ultra-Filtration Hollow Fiber Quick-Change Drinking Water Filter System with 4 Reusable Glass Water Bottles by Tier1

    4-Stage Ultra-Filtration Hollow Fiber Quick-Change Drinking Water Filter System with 4 Reusable Glass Water Bottles by Tier1

    Installs directly onto the cold water supply Learn More

    (Retail Price: $199.99 ) $176.99

  18. US-ST04 Tier1 Undersink Smart Tap Replacement Filter Cartridge
  19. 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System PLUS Filter Change Set by Tier1 (Quick Change)

    4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System PLUS Filter Change Set by Tier1 (Quick Change)

    Installs directly onto the cold water supply Learn More

    (Retail Price: $317.99 ) $209.99

  20. 10 x 2.5 Inch 10 Stage Countertop or Undersink Filter Cartridge Replacement by Tier1

    10 x 2.5 Inch 10 Stage Countertop or Undersink Filter Cartridge Replacement by Tier1

    This filter will not fit the New Wave Filter Housing. This 10 x 2.5 standard cartridge size can fit in all standard 10 x 2.5 housings! Learn More

    As Low As $38.99 Per Filter

  21. FM-1500 Water Factory Systems Under Sink Drinking Water System
  22. US-DC2-R Culligan Direct Connect Advanced Replacement Filter

    US-DC2-R Culligan Direct Connect Advanced Replacement Filter

    Fits US-DC2 Culligan Direct Connect Under Sink Quick Change Advanced Water System Learn More
    $28.99 MSRP:  $34.79
  23. WFQTC70001 DuPont Quicktwist Undersink Carbon Block Filter

    WFQTC70001 DuPont Quicktwist Undersink Carbon Block Filter

    Fits DuPont Quick Twist Drinking Water Filtration Systems, DuPont WFQT3900 Water Filtration System Learn More
    $29.99
  24. 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
  25. 600R American Plumber Undersink Filter Replacement Cartridge

    600R American Plumber Undersink Water Filter Cartridge

    Built to fit into American Plumber WIC-600 and DW-600 undersink water filtration systems Learn More
    $31.99 MSRP:  $35.06

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