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. Everpure H-54 Water Filter Replacement Cartridge (EV9730-06)
  3. Aqua-Pure 3M Easy Full Flow Drinking Water Filtration System CYST-FF
  4. P-12 Under Sink Water Replacement Filter Cartridge by Tier1
  5. WFDW120009W DuPont Universal Drinking Water Filter System

    WFDW120009W DuPont Universal Drinking Water Filter System

    Fits DuPont WFDW 2000 series, 4000 series, 7000 series Learn More
  6. 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
  7. WFDWC20001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC20001 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
  8. WFDWC40001 DuPont Universal Drinking Water Carbon Block Cartridge

    WFDWC40001 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
  9. CMB-510-HF Advanced Water Products 10-inch x 4.5-inch Replacement Sediment Filter

    Advanced Water Products CMB-510-HF Whole House Filter for IHS12-D4 System

    Made for the Trojan UV Max IHS12-D4 Water Disinfection System Learn More
  10. CMB-520-HF Advanced Water Products 20-inch x 4.5-inch Replacement Sediment Filter

    Advanced Water Products CMB-520-HF Whole House Filter for IHS22-D4 System

    Made for the Trojan UV Max IHS22-D4 Water Disinfection System Learn More
  11. C2-02 Advanced Water Products 20-inch x 4.5-inch Replacement Carbon Whole House Filter

    C2-02 Advanced Water Products Replacement 20-inch x 4.5-inch Carbon Whole House Filter

    Fits most 20-inch x 4.5-inch filter housings, including the Trojan UV Max IHS12-D4 and IHS22-D4 Water Disinfection Systems Learn More
  12. DUPONT-WFQTC90001

    DuPont WFQTC90001 Quick Twist 3rd Stage Replacement Filter

    Fits the Dupont-WFQT39000 Quick Twist Water Filter System Learn More
  13. BF7-S-06 OmniFilter Undersink Filter System
  14. 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
  15. 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
  16. 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
  17. W9222903 Doulton Ceramic Supercarb M15 Replacement Undersink Cartridge
  18. 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
  19. 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
  20. US-UF-100-SDRF-5 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacemen Sediment Filter by Tier1 (5 Micron)

    US-UF-100-SDRF-5 4-Stage Ultra-Filtration Hollow Fiber Drinking Water System Replacemen Sediment Filter by Tier1 (5 Micron)

    Fits the 4-Stage Ultra-Filtration Hollow Fiber Drinking Water Filter System by Tier1 Learn More
    $13.99 MSRP:  $49.99
  21. 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
  22. 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

  23. EP-10 155531-43 Pentek Carbon Filter Cartridge Comparable Replacement Kit with O-ring and Lubricant by Tier1
  24. P5 155014-43 Pentek Spun Polypropylene Filter Cartridge Comparable Replacement Kit with O-ring and Lubricant by Tier1 (9-3/4 inch x 2-3/8 inch)
  25. 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

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