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.

37 Item(s)

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  • 600R American Plumber Undersink Filter Replacement Cartridge

    600R American Plumber Undersink Water Filter Cartridge

    $31.99
    MSRP: $35.06
    Save 9%
  • 3M Aqua-Pure AP-C78 Water Filter Replacement Cartridge
  • AP-DW80/90 3M Aqua-Pure Water Filter Set

    AP-DW80/90 3M Aqua-Pure Pre and Post Filter Set

    $116.99
    MSRP: $173.90
    Save 33%
  • C-COMPLETE 3M Aqua-Pure Undersink Water Filter

    C-COMPLETE 3M Aqua-Pure Undersink Water Filter Cartridge

    $71.69
    MSRP: $92.99
    Save 23%
  • C-CS-S 3M Aqua-Pure Undersink Water Filter

    C-CS-S 3M Aqua-Pure Undersink Water Filter Cartridge

    $38.99
    MSRP: $50.99
    Save 24%
  • C-LC 3M Aqua-Pure Undersink Water Filter

    C-LC 3M Aqua-Pure Undersink Water Filter Cartridge

    $50.99
    MSRP: $65.54
    Save 22%
  • 1000R-D Culligan Level 3 Undersink RV and Marine Icemaker and Drinking Water Filter
  • D-40 Culligan Level 4 Undersink Water Filter Replacement Cartridge
  • SY-1000 Culligan Water Filtration System
  • US-EZ-3 Culligan Level 3 Easy-Change Undersink Filter System
  • US-EZ-4 Culligan Level 4 Easy-Change Undersink Filter System

    US-EZ-4 Culligan Level 4 Easy-Change Undersink Filter System

    $83.49
    MSRP: $110.99
    Save 25%
  • W9123053 Doulton UltraCarb Undersink Ceramic Candle Replacement Filter Cartridge
  • W9330957 Doulton UltraCarb Undersink Ceramic Candle Filter System
  • EV9300-15 Everpure proseries 1500 Replacement Filter Cartridge
  • 4US-MAXL-F01 Filtrete Replacement Filter Cartridge

    4US-MAXL-F01 3M Filtrete Replacement Water Filter Cartridge

    $34.19
    MSRP: $44.99
    Save 24%
  • 4US-MAXL-S01 Filtrete Single Stage Drinking Water System
  • 4US-MAXS-F01 Filtrete Replacement Filter Cartridge

    4US-MAXS-F01 3M Filtrete Water Filter Cartridge

    $20.99
    MSRP: $25.29
    Save 17%
  • 4US-MAXS-S01 Filtrete Single Stage Drinking Water System

    4US-MAXS-S01 3M Filtrete Drinking Water Filtration System

    $68.99
    MSRP: $88.54
    Save 22%
  • FXSVC GE SmartWater Undersink Filter Set

    FXSVC GE SmartWater Undersink Filter Set

    $65.29
    MSRP: $89.99
    Save 27%
  • FXUVC GE SmartWater Undersink Filter Replacement Cartridge

    FXUVC GE SmartWater Undersink Filter Replacement Cartridge

    $58.79
    MSRP: $80.99
    Save 27%
  • P-250A Pentek Undersink Filter Set
  • QC10-CBR-JG14 Pentek Undersink Quick-Change Filter System

    QC10-CBR-JG14 Pentek Quick-Change Water Filter System

    $33.99
    MSRP: $35.41
    Save 4%
  • QC10-CBR-THREADED Pentek Undersink Quick-Change Filter System
  • QC10-CBRR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • US-1000 Pentek Undersink Filter System

    US-1000 Pentek Undersink Filter System

    $135.89
    MSRP: $179.99
    Save 25%
  • F-201 InSinkErator Instant Hot Water Dispenser Filtration System
  • F-201R InSinkErator Instant Hot Water Dispenser Replacement Filter Cartridge (2-Pack)
  • CBF2-S-05 OmniFilter Undersink Filter System
  • CBR2-10R Pentek Undersink Filter Replacement Cartridge

    CBR2-10R Pentek Undersink Filter Replacement Cartridge

    $20.29
    MSRP: $27.99
    Save 28%
  • EV9601-77 Everpure VOC #2 Replacement Filter Cartridge

    EV9601-77 Everpure VOC #2 Replacement Filter Cartridge

    $134.79
    MSRP: $171.99
    Save 22%
  • BG-1000 Body Glove Water Filtration System

    BG-1000 Body Glove Water Filtration System

    $343.99
    MSRP: $426.95
    Save 19%
  • BG-1000C Body Glove Replacement Water Filter Cartridge

    BG-1000C Body Glove Replacement Water Filter Cartridge

    $119.99
    MSRP: $139.95
    Save 14%
  • Everpure H-54 Water Filter Replacement Cartridge (EV9730-06)
  • 3M Aqua-Pure APDWS1000 Undersink Water Filter System

    APDWS1000 Undersink Water Filter System by 3M Aqua-Pure

    $422.59
    MSRP: $547.99
    Save 23%
  • WFDW120009W DuPont Universal Drinking Water Filter System
  • WFDWC20001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFDWC40001 DuPont Universal Drinking Water Carbon Block Cartridge

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