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!

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  • Your filters are guaranteed to be the right fit!
  • 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.

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  • SPC-25-1030 Hydronix Pleated Sediment Water Filter

    SPC-25-1030 Hydronix Pleated Sediment Water Filter

    $7.99
    MSRP: $13.21
    Save 40%
  • WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1
  • SPC-25-1030 Hydronix Comparable Pleated Sediment Water Filter by Tier1
  • RS14SS Comparable Sediment Water Filter by Tier1

    RS14SS Comparable Sediment Water Filter by Tier1

    $5.99 MSRP: $6.99
    Save 14%
  • R50-BBSA-D Culligan Comparable Whole House Water Filter by Tier1
  • WHKF-WHSW Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1 (2-Pack)
  • W5W American Plumber Comparable Whole House Sediment Filter Cartridge by Tier1 (2-Pack)
  • WHKF-WHPL Whirlpool Comparable Whole House Replacement Sediment Filter Cartridge by Tier1 (2-Pack)
  • PCC-1 Pentek Undersink Filter Replacement Cartridge

    PCC-1 Pentek Undersink Filter Replacement Cartridge

    $43.29
    MSRP: $58.99
    Save 27%
  • PENTEK-SLIM-PR10-JG38 Pentek Undersink Filter 10 inch Housing
  • 158008 Pentek Slim Line Filter Housing - Clear

    158008 Pentek Slim Line Water Filter Housing - Clear

    $12.79
    MSRP: $16.55
    Save 23%
  • 158117 Pentek Slim Line Filter Housing - Clear

    158117 Pentek Slim Line Filter Housing - Clear

    $18.99
    MSRP: $24.14
    Save 21%
  • 158642 Pentek Slim Line Filter Housing - Blue

    158642 Pentek Slim Line Filter Housing - Blue

    $19.99
    MSRP: $25.29
    Save 21%
  • 158643 Pentek Slim Line Filter Housing with Pressure Relief Valve - Clear
  • 3G-SLIM-38-NPT10 Pentek Whole House Slim 10 inch Filter Housing
  • C1 Pentek Undersink Filter Replacement Cartridge
  • C2 Pentek Undersink Filter Replacement Cartridge

    C2 Pentek Undersink Filter Replacement Cartridge

    $8.29
    MSRP: $12.99
    Save 36%

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