Discount Water Filters and Air Filters at Discount Filter

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.

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  • W5CIP478 American Plumber Undersink Compact Filter Replacement Cartridge (2-Pack)
  • 750R-D Culligan Level 1 Undersink RV and Marine Icemaker and Drinking Water Filter


    MSRP: $45.76
    Save 21%
  • W9120145 Doulton Replacement Candle Set (6-Pack)

    W9120145 Doulton Replacement Candle Set (6-Pack)

    MSRP: $118.30
    Save 10%
  • W9120562 Doulton Sterasyl Undersink Ceramic Candle Replacement Filter Cartridge
  • W9330962 Doulton Sterasyl Undersink Ceramic Candle Filter System
  • FXUTC GE SmartWater Undersink Filter Replacement Cartridge

    FXUTC GE SmartWater Undersink Filter Replacement Cartridge

    MSRP: $35.99
    Save 34%


    MSRP: $13.99
    Save 29%
  • QC10-GAC Pentek Undersink Quick-Change Filter System

    QC10-GAC Pentek Quick-Change Water Filter System

    MSRP: $42.99
    Save 45%
  • QC10-GACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • 47-55708G2 Water Factory Systems Replacement Filter Cartridge
  • MATRIKX-Pb1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge


    MSRP: $21.38
    Save 21%


    MSRP: $19.99
    Save 25%


    MSRP: $16.55
    Save 38%
  • OMNIPURE-E5620


    MSRP: $36.79
    Save 45%
  • KX Matrikx CTO2-12 Reverse Osmosis Carbon Block Replacement Filter
  • GAC-20 Pentek Comparable Granular Activated Carbon Water Filter by Tier1
  • RFC-93 Whole House Filter Replacement Cartridge by Tier1

19 Item(s)

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