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!
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  • 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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  • W9222900 Doulton Ceramic Water Filter
  • HYDROLOGIC-36005

    HYDROLOGIC-36005

    $101.99
    MSRP: $119.59
    Save 15%
  • Everpure H-54 Water Filter Replacement Cartridge (EV9730-06)

    Everpure H-54 Water Filter Replacement Cartridge (EV9730-06)

    $71.24
    MSRP: $128.79
    Save 45%
  • HYDROLOGIC-31050

    HYDROLOGIC-31050

    $153.99
    MSRP: $183.95
    Save 16%
  • P-12 Under Sink Water Replacement Filter Cartridge by Tier1
  • AQUA-PURE-APDWS1000

    AQUA-PURE-APDWS1000

    $394.99
  • WFDW120009W DuPont Universal Drinking Water Filter System
  • WFDWC70001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFDWC20001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFDWC40001 DuPont Universal Drinking Water Carbon Block Cartridge
  • WFHDC8001 DuPont Universal Heavy Duty Carbon Wrap 2-Phase Cartridge
  • ADVANCED-WATER-CMB-510-HF
  • ADVANCED-WATER-CMB-520-HF
  • ADVANCED-WATER-C2-02
  • CULLIGAN-D-25

    CULLIGAN-D-25

    $11.99
  • CB1-10 Pentek Carbon Block Water Filter Replacement

    CB1-10 Pentek Carbon Block Water Filter Replacement

    $14.99
    MSRP: $19.99
    Save 25%
  • DUPONT-WFQTC90001
  • BF7-S-06 OmniFilter Undersink Filter System

    BF7-S-06 OmniFilter Undersink Filter System

    $81.99
    MSRP: $85.99
    Save 5%
  • KX Matrikx CTO2-12 Reverse Osmosis Carbon Block Replacement Filter
  • D-250A Culligan Comparable Under Sink Water Filter Set by Tier1
  • 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

    $24.99 MSRP: $41.99
    Save 40%
  • WHKF-DB1 Whirlpool Comparable Under Sink Water Filter by Tier1
  • WHKF-DB2 Whirlpool Comparable Under Sink Water Filter by Tier1
  • OmniFilter RS12-SS6-05 Polypropylene Sediment Filter

    OmniFilter RS12-SS6-05 Polypropylene Sediment Filter

    $4.99
    MSRP: $8.04
    Save 38%
  • Pentek QC10-CB1R Carbon Block Quick Change Filter
  • AQUAPURE-AP327

    AQUAPURE-AP327

    $37.99
  • 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%
  • AMERICAN-PLUMBER-600R

    AMERICAN-PLUMBER-600R

    $31.99
    MSRP: $35.06
    Save 9%
  • AMERICAN-PLUMBER-DW-2000-RB

    AMERICAN-PLUMBER-DW-2000-RB

    $59.99
    MSRP: $61.28
    Save 2%
  • AMERICAN-PLUMBER-DW-200-R

    AMERICAN-PLUMBER-DW-200-R

    $18.99
    MSRP: $21.15
    Save 10%
  • AMERICAN-PLUMBER-W385-PR

    AMERICAN-PLUMBER-W385-PR

    $19.99
    MSRP: $20.69
    Save 3%
  • AMERICAN-PLUMBER-W5CIP

    AMERICAN-PLUMBER-W5CIP

    $21.99
  • AMERICAN-PLUMBER-W5CIP478

    AMERICAN-PLUMBER-W5CIP478

    $16.99
    MSRP: $17.24
    Save 1%
  • AMERICAN-PLUMBER-WCC

    AMERICAN-PLUMBER-WCC

    $19.99
  • AMERICAN-PLUMBER-WGC478

    AMERICAN-PLUMBER-WGC478

    $13.99
    MSRP: $14.94
    Save 6%
  • AMERICAN-PLUMBER-WGCHD

    AMERICAN-PLUMBER-WGCHD

    $34.99
    MSRP: $35.64
    Save 2%
  • AQUAPURE-AP200

    AQUAPURE-AP200

    $87.05
    MSRP: $135.69
    Save 36%
  • AQUAPURE-AP217

    AQUAPURE-AP217

    $36.99
  • AQUAPURE-AP22

    AQUAPURE-AP22

    $56.05
    MSRP: $75.89
    Save 26%
  • AQUAPURE-AP-250R

    AQUAPURE-AP-250R

    $29.99
    MSRP: $41.39
    Save 28%
  • AQUAPURE-AP317

    AQUAPURE-AP317

    $52.99
    MSRP: $66.69
    Save 21%
  • AQUA-PURE-AP410

    AQUA-PURE-AP410

    $64.99
    MSRP: $71.29
    Save 9%
  • AQUAPURE-AP517

    AQUAPURE-AP517

    $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

Items 1 to 48 of 251 total

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