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.

Items 1 to 48 of 251 total

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  • AP327 3M Aqua-Pure Water Filter Replacement Cartridge
  • 4373529 Whirlpool Undersink Filter Replacement Cartridge

    4373529 Whirlpool Undersink Filter Replacement Cartridge

    $43.99
    MSRP: $50.59
    Save 13%
  • 4373574 Whirlpool Undersink Filter Kit
  • 4373575 Whirlpool Undersink Filter Kit

    4373575 Whirlpool Undersink Filter Kit

    $59.99
    MSRP: $74.74
    Save 20%
  • 600R American Plumber Undersink Filter Replacement Cartridge

    600R American Plumber Undersink Water Filter Cartridge

    $31.99
    MSRP: $35.06
    Save 9%
  • DW-2000-RB American Plumber Replacement Filter Cartridge

    DW-2000-RB American Plumber Replacement Filter Cartridge

    $59.99
    MSRP: $61.28
    Save 2%
  • DW-200-R American Plumber Undersink Filter Replacement Cartridge
  • W385-PR American Plumber Undersink Compact Filter System

    W385-PR American Plumber Undersink Compact Filter System

    $19.99
    MSRP: $28.74
    Save 30%
  • W5CIP American Plumber Undersink Filter Replacement Cartridge (2-Pack)
  • W5CIP478 American Plumber Undersink Compact Filter Replacement Cartridge (2-Pack)
  • WCC American Plumber Undersink Filter Replacement Cartridge

    WCC American Plumber Undersink Filter Replacement Cartridge

    $19.99
    MSRP: $26.44
    Save 24%
  • WGC478 American Plumber Undersink Compact Filter Replacement Cartridge
  • WGCHD American Plumber Undersink Water Filter Replacement Cartridge
  • 3M Aqua-Pure AP200 Under Sink Water Filter

    AP200 3M Aqua-Pure Undersink Water Filtration System

    $87.05
    MSRP: $135.69
    Save 36%
  • 3M Aqua-Pure AP217 Under Sink Water Filter

    3M Aqua-Pure AP217 Undersink Filter Replacement Cartridge

    $36.99
    MSRP: $86.53
    Save 57%
  • 3M Aqua-Pure AP22 Under Sink Water Filter
  • 3M Aqua-Pure AP-250R Under Sink Water Filter

    AP-250R 3M Aqua-Pure Undersink Water Filter Cartridge

    $29.99
    MSRP: $41.39
    Save 28%
  • 3M Aqua-Pure AP317 Water Filter Replacement Cartridge

    AP317 3M Aqua-Pure Undersink Filter Replacement Cartridge

    $52.99
    MSRP: $66.69
    Save 21%
  • 3M Aqua-Pure AP410 Water Filter Cartridges

    AP410 3M Aqua-Pure Water Filter Cartridge Set (2-Pack)

    $64.99
    MSRP: $71.29
    Save 9%
  • 3M Aqua-Pure AP517 Water Filter Replacement Cartridge

    AP517 3M Aqua-Pure Undersink Filter Replacement Cartridge

    $66.99
    MSRP: $70.14
    Save 4%
  • 3M Aqua-Pure AP-C77 Undersink Filter Replacement Cartridge
  • 3M Aqua-Pure AP-C78 Water Filter Replacement Cartridge
  • 3M Aqua-Pure AP-DW70 Undersink Filter Replacement Cartridge

    AP-DW70 3M Aqua-Pure Undersink Filter Replacement Cartridge

    $47.99
    MSRP: $56.34
    Save 15%
  • 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%
  • 3M Aqua-Pure AP-DW85 Water Filter Replacement Cartridge
  • C-COMPLETE 3M Aqua-Pure Undersink Water Filter

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

    $66.99
    MSRP: $88.54
    Save 24%
  • C-CS-FF 3M Aqua-Pure Undersink Water Filter

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

    $43.99
    MSRP: $48.06
    Save 8%
  • C-CS-S 3M Aqua-Pure Undersink Water Filter

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

    $37.99
    MSRP: $42.54
    Save 11%
  • C-CYST-FF 3M Aqua-Pure Undersink Water Filter

    C-CYST-FF 3M Aqua-Pure Undersink Water Filter Cartridge

    $52.99
    MSRP: $56.34
    Save 6%
  • C-LC 3M Aqua-Pure Undersink Water Filter

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

    $50.99
    MSRP: $65.54
    Save 22%
  • EP35R 3M Aqua-Pure Water Filter Cartridge

    EP35R 3M Aqua-Pure Replacement Water Filter Cartridge

    $115.99
    MSRP: $123.04
    Save 6%
  • A101 Aries Undersink Filter Replacement Cartridge

    A101 Aries Undersink Filter Replacement Cartridge

    $33.99
    MSRP: $49.21
    Save 31%
  • WI-BG12000C Body Glove Replacement Filter Cartridge

    WI-BG12000C Body Glove Replacement Filter Cartridge

    $290.21
    MSRP: $386.95
    Save 25%
  • WI-BG3000C Body Glove Replacement Filter Cartridge

    WI-BG3000C Body Glove Replacement Filter Cartridge

    $158.99
    MSRP: $192.95
    Save 18%
  • WI-BG3000R Body Glove Replacement Filter Cartridge

    WI-BG3000R Body Glove Replacement Filter Cartridge

    $145.99
    MSRP: $174.95
    Save 17%
  • CB1 OmniFilter Undersink Filter Replacement Cartridge
  • CB3 OmniFilter Undersink Filter Replacement Cartridge
  • CB6 OmniFilter Whole House Filter Replacement Cartridge
  • CQE-RC-04002 Crystal Quest PLUS Multi-Stage Replacement Filter Cartridge
  • D-15 Culligan Level 1 Undersink Filter Replacement Cartridge (2-Pack)
  • D-20A Culligan Level 1 Undersink Water Filter Replacement Cartridge
  • D-250A Culligan Undersink Filter Replacement Cartridge Set

    D-250A Culligan Undersink Filter Replacement Cartridge Set

    $30.99
    MSRP: $44.99
    Save 31%
  • D-28 Culligan Level 1 Undersink Filter Replacement Cartridge
  • D-30 Culligan Level 2 Undersink Filter Replacement Cartridge
  • D-40 Culligan Level 4 Undersink Water Filter Replacement Cartridge

Items 1 to 48 of 251 total

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