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.

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Items 1 to 48 of 87 total

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  • AMERICAN-PLUMBER-W5CIP

    AMERICAN-PLUMBER-W5CIP

    $21.99
  • WGCHD American Plumber Undersink Water Filter Replacement Cartridge
  • PENTEK-EPM-10

    PENTEK-EPM-10

    $9.99
    MSRP: $13.99
    Save 29%
  • GAC-10 Pentek Undersink Filter Replacement Cartridge

    GAC-10 Pentek Undersink Filter Replacement Cartridge

    $14.99
    MSRP: $19.99
    Save 25%
  • GAC-20 Pentek Replacement Filter Cartridge

    GAC-20 Pentek Replacement Filter Cartridge

    $18.49
    MSRP: $29.99
    Save 38%
  • GAC-5 Pentek Replacement Filter Cartridge
  • GAC-BB Pentek Replacement Filter Cartridge

    GAC-BB Pentek Replacement Filter Cartridge

    $26.99
    MSRP: $36.99
    Save 27%
  • NCP-10 Pentek Undersink Filter Replacement Cartridge

    NCP-10 Pentek Undersink Filter Replacement Cartridge

    $10.29
    MSRP: $15.99
    Save 36%
  • PENTEK-P-250

    PENTEK-P-250

    $33.99
    MSRP: $41.99
    Save 19%
  • PENTEK-P-250A

    PENTEK-P-250A

    $33.99
  • P5-478 Pentek Undersink Filter Replacement Cartridge

    P5-478 Pentek Undersink Filter Replacement Cartridge

    $6.99
    MSRP: $8.15
    Save 14%
  • PCC-1 Pentek Undersink Filter Replacement Cartridge

    PCC-1 Pentek Undersink Filter Replacement Cartridge

    $43.29
    MSRP: $58.99
    Save 27%
  • QC10-CB1 Pentek Undersink Quick-Change Filter System
  • 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
  • QC10-EP Pentek Undersink Quick-Change Filter System

    QC10-EP Pentek Quick-Change Filter System

    $29.99
    MSRP: $34.26
    Save 12%
  • QC10-EPR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • QC10-GAC Pentek Undersink Quick-Change Filter System

    QC10-GAC Pentek Quick-Change Water Filter System

    $23.69
    MSRP: $42.99
    Save 45%
  • QC10-GACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • QC10-TSGAC Pentek Undersink Quick-Change Filter System

    QC10-TSGAC Pentek Quick-Change Water Filter Cartridge

    $26.39
    MSRP: $39.99
    Save 34%
  • QC10-TSGACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • R30-478 Pentek Undersink Filter Replacement Cartridge

    R30-478 Pentek Undersink Filter Replacement Cartridge

    $8.99
    MSRP: $12.75
    Save 29%
  • SLIM-14-WPR5 Pentek Whole House Slim 5 inch Filter Housing

    SLIM-14-WPR5 Pentek Whole House Slim 5 inch Filter Housing

    $12.99
    MSRP: $17.24
    Save 25%
  • SLIM-38-PR5 Pentek Whole House Slim 5 inch Filter Housing

    SLIM-38-PR5 Pentek Whole House Slim 5 inch Filter Housing

    $12.39
    MSRP: $16.55
    Save 25%
  • SLIM-CLEAR-14-WPR5 Pentek Whole House Slim 5 inch Filter Housing
  • PENTEK-SLIM-PR10-JG38 Pentek Undersink Filter 10 inch Housing
  • TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    $20.99
    MSRP: $24.60
    Save 15%
  • US-1000 Pentek Undersink Filter System

    US-1000 Pentek Undersink Filter System

    $130.79
    MSRP: $179.99
    Save 27%
  • PENTEK-US-1500

    PENTEK-US-1500

    $172.09
    MSRP: $195.37
    Save 12%
  • PENTEK-153017

    PENTEK-153017

    $11.29
    MSRP: $15.28
    Save 26%
  • PENTEK-153018

    PENTEK-153018

    $18.99
    MSRP: $21.84
    Save 13%
  • PENTEK-153029

    PENTEK-153029

    $32.99
  • PENTEK-153128

    PENTEK-153128

    $19.99
    MSRP: $23.56
    Save 15%
  • PENTEK-158008

    PENTEK-158008

    $12.79
    MSRP: $16.55
    Save 23%
  • PENTEK-158110

    PENTEK-158110

    $18.99
    MSRP: $22.41
    Save 15%
  • PENTEK-158117

    PENTEK-158117

    $18.99
  • PENTEK-158642

    PENTEK-158642

    $19.99
  • PENTEK-158643

    PENTEK-158643

    $24.99
    MSRP: $25.98
    Save 4%
  • PENTEK-3G-SLIM-38-NPT10

    PENTEK-3G-SLIM-38-NPT10

    $19.99
  • PENTEK-BFS-201

    PENTEK-BFS-201

    $53.99
    MSRP: $56.80
    Save 5%
  • PENTEK-C1

    PENTEK-C1

    $14.99
    MSRP: $19.99
    Save 25%
  • PENTEK-C2

    PENTEK-C2

    $8.29
    MSRP: $8.84
    Save 6%
  • PENTEK-CBC-5

    PENTEK-CBC-5

    $10.29
    MSRP: $16.55
    Save 38%
  • PENTEK-CBR2-10

    PENTEK-CBR2-10

    $18.99
  • PENTEK-CBR2-10R

    PENTEK-CBR2-10R

    $19.59
    MSRP: $21.95
    Save 11%
  • PENTEK-CC-10

    PENTEK-CC-10

    $15.39
  • PENTEK-CCBC-10

    PENTEK-CCBC-10

    $19.59

Items 1 to 48 of 87 total

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