Discount Water Filters and Air Filters at Discount Filter Store.com

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Under Sink Water Filter Replacement Cartridges

Don’t settle for a replacement under sink water filter cartridge that simply fits, find one designed and manufactured specifically for your under sink water filter system.

Discount Filter Store has one of the largest selections of undersink filter cartridges. With under sink filter cartridges available in over 15+ different filter medias, 8+ different sizes (5x2½ - 20x4½), and a wide variety of filter life’s ranging from 250 gallons to 50,000+ gallons, you’re guaranteed to find the under sink water filter system and/or replacement cartridges you need. Choose from hundreds of under sink water filter cartridges from some of the industry’s top brands including American Plumber, Crystal Quest, Pentek®, Culligan®, GE, Aqua-Pure®, Whirlpool®, and more.

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Items 1 to 48 of 63 total

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  • Pentek QC10-CB1R Carbon Block Quick Change Filter
  • W5CIP American Plumber Undersink Filter Replacement Cartridge (2-Pack)
  • WGCHD American Plumber Undersink Water Filter Replacement Cartridge
  • PENTEK-EPM-10

    PENTEK-EPM-10

    $9.99
    MSRP: $13.99
    Save 29%
  • PENTEK-GAC-10

    PENTEK-GAC-10

    $14.99
    MSRP: $17.99
    Save 17%
  • PENTEK-GAC-20

    PENTEK-GAC-20

    $18.49
    MSRP: $23.56
    Save 22%
  • PENTEK-GAC-5

    PENTEK-GAC-5

    $14.99
  • PENTEK-GAC-BB

    PENTEK-GAC-BB

    $26.99
  • PENTEK-NCP-10

    PENTEK-NCP-10

    $10.29
    MSRP: $11.95
    Save 14%
  • PENTEK-P-250

    PENTEK-P-250

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

    PENTEK-P-250A

    $33.99
  • PENTEK-P5-478

    PENTEK-P5-478

    $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-CBRR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • QC10-EPR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • QC10-GACR Pentek Undersink Quick-Change Replacement Filter Cartridge
  • 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%
  • TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    TSGAC-10 Pentek Undersink Filter Replacement Cartridge

    $20.99
    MSRP: $24.60
    Save 15%
  • 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
  • CCBC-10 Pentek Undersink Filter Replacement Cartridge

    CCBC-10 Pentek Undersink Filter Replacement Cartridge

    $19.59
    MSRP: $27.99
    Save 30%
  • PENTEK-CRE-1

    PENTEK-CRE-1

  • PENTEK-ECP5-10

    PENTEK-ECP5-10

    $9.19
    MSRP: $9.42
    Save 2%
  • PENTEK-EP-5

    PENTEK-EP-5

    $7.19
  • HYDRONIX-SPC-25-1030

    HYDRONIX-SPC-25-1030

    $9.99
  • TIER1-P10-5

    TIER1-P10-5

    $3.99
    MSRP: $5.74
    Save 30%
  • TIER1-P1-5

    TIER1-P1-5

    $4.99
    MSRP: $5.74
    Save 13%
  • PENTEK-CB1-10

    PENTEK-CB1-10

    $15.39
  • P-250 Pentek Comparable Under Sink Water Filter Set by Tier1
  • P-250A Pentek Comparable Under Sink Filter Set by Tier1

    P-250A Pentek Comparable Under Sink Filter Set by Tier1

    $21.99 MSRP: $41.99
    Save 48%
  • WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1
  • WHKF-DB2 Whirlpool Comparable Under Sink Water Filter by Tier1
  • WRC25HD20 American Plumber Comparable Granular Activated Carbon Filter by Tier1
  • GAC20-BB Pentek Comparable Granular Activated Carbon Filter by Tier1
  • AP817-2 Aquapure Comparable Granular Activated Carbon Filter by Tier1
  • FXB20RFL Filtrex Comparable Granular Activated Carbon Filter by Tier1
  • FXULC GE SmartWater Comparable Undersink Filter Replacement Cartridge by Tier1
  • RFC-93 Whole House Filter Replacement Cartridge by Tier1
  • RFC-20 Pentek Whole House Filter Replacement Cartridge by Tier1
  • RS14SS Comparable Sediment Water Filter by Tier1
  • R50-BBSA-D Culligan Comparable Whole House Water Filter by Tier1
  • AP124 3M Aqua-Pure Comparable Whole House Filter Replacement Cartridge by Tier1
  • WP-5 Pentek Comparable Replacement Filter Cartridge by Tier1

Items 1 to 48 of 63 total

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