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 193 to 240 of 272 total

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  • MATRIKX-Pb1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge
  • MATRIKX-Pb1-HD10 KX Technologies MatrikX Undersink Filter Replacement Cartridge
  • 32-250-125-050 KX Technologies Replacement Filter Cartridge

    32-250-125-050 KX Technologies Replacement Filter Cartridge

    $11.29
    MSRP: $16.99
    Save 34%
  • CBF2-S-05 OmniFilter Undersink Filter System
  • OB1-S-05 OmniFilter Undersink Filter System
  • RS19 OmniFilter Reusable Screen Filter Cartridge

    RS19 OmniFilter Reusable Screened Water Filter Cartridge

    $14.49
    MSRP: $20.99
    Save 31%
  • SFM2 OmniFilter Undersink Water Filter System

    USM2-S-S06 OmniFilter Undersink Water Filtration System

    $35.99
    MSRP: $48.29
    Save 25%
  • OMB934-1L Omnipure Alpha Series Undersink Filter Replacement Cartridge
  • 153017 Pentek Slim Line Filter Housing Sump - Blue

    153017 Pentek Slim Line Filter Housing Sump - Blue

    $11.29
    MSRP: $15.28
    Save 26%
  • 153018 Pentek Slim Line Filter Housing Sump - Clear

    153018 Pentek Slim Line Filter Housing Sump - Clear

    $18.99
    MSRP: $21.84
    Save 13%
  • 153029 Pentek Filter Housing Sump

    153029 Pentek Filter Housing Sump

    $32.99
    MSRP: $40.24
    Save 18%
  • 153128 Pentek Filter Housing Sump - Clear

    153128 Pentek Filter Housing Sump - Clear

    $19.99
    MSRP: $23.56
    Save 15%
  • 158008 Pentek Slim Line Filter Housing - Clear

    158008 Pentek Slim Line Water Filter Housing - Clear

    $12.79
    MSRP: $16.55
    Save 23%
  • 158110 Pentek Filter Housing - Clear

    158110 Pentek Filter Housing - Clear

    $18.99
    MSRP: $22.41
    Save 15%
  • 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
  • BFS-201 Pentek Slim Line Filter Housing with Pressure Relief Valve
  • 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%
  • CBC-5 Pentek Undersink Filter Replacement Cartridge

    CBC-5 Pentek Undersink Filter Replacement Cartridge

    $10.29
    MSRP: $15.99
    Save 36%
  • CBR2-10 Pentek Undersink Filter Replacement Cartridge
  • CBR2-10R Pentek Undersink Filter Replacement Cartridge

    CBR2-10R Pentek Undersink Filter Replacement Cartridge

    $19.59
    MSRP: $27.99
    Save 30%
  • CC-10 Pentek Undersink Filter Replacement Cartridge

    CC-10 Pentek Undersink Filter Replacement Cartridge

    $15.39
    MSRP: $21.99
    Save 30%
  • CCBC-10 Pentek Undersink Filter Replacement Cartridge

    CCBC-10 Pentek Undersink Filter Replacement Cartridge

    $19.59
    MSRP: $27.99
    Save 30%
  • CRE-1 Pentek Undersink Filter Replacement Cartridge

    CRE-1 Pentek Undersink Filter Replacement Cartridge

    $24.69
    MSRP: $34.99
    Save 29%
  • ECP5-10 Pentek Undersink Filter Replacement Cartridge

    ECP5-10 Pentek Undersink Filter Replacement Cartridge

    $9.19
    MSRP: $13.99
    Save 34%
  • EP-5 Pentek Replacement Filter Cartridge

    EP-5 Pentek Replacement Filter Cartridge

    $7.19
    MSRP: $11.99
    Save 40%
  • RS4-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)
  • W9222910 Doulton Replacement Ceramic Filter
  • W9123085 Doulton Imperial UltraCarb Undersink Ceramic Candle Replacement Filter Cartridge
  • W9330958 Doulton SuperCarb Undersink Ceramic Candle Filter System
  • W9121302 Doulton Imperial Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge
  • W9121202 Doulton AquaCera Supersterasyl Undersink Ceramic Candle Replacement Filter Cartridge
  • W9320007 Doulton Undersink Ceramic Candle Filter Housing

    W9320007 Doulton Undersink Ceramic Candle Filter Housing

    $110.00
    MSRP: $215.99
    Save 49%
  • BGE-3200 BevGuard Water Filter Cartridge

    BGE-3200 BevGuard Water Filter Cartridge

    $80.39
    MSRP: $102.99
    Save 22%
  • BGE-3200S BevGuard Water Filter Cartridge

    BGE-3200S BevGuard Water Filter Cartridge

    $89.69
    MSRP: $113.99
    Save 21%
  • BGE-4200S BevGuard Water Filter Cartridge

    BGE-4200S BevGuard Water Filter Cartridge

    $75.99
    MSRP: $94.99
    Save 20%
  • BGE-4200 BevGuard Water Filter Replacement Cartridge

    BGE-4200 BevGuard Water Filter Replacement Cartridge

    $63.29
    MSRP: $86.99
    Save 27%
  • WQCFU-T-KIT Watts Triple Drinking Water Filtration System w/Kwik-Change Filter Cartridges
  • WHEEDF Whirlpool UltraEase Water Filter Pack

    WHEEDF Whirlpool UltraEase Water Filter Pack

    $47.99
    MSRP: $59.79
    Save 20%
  • E5520-K Omnipure Water Filter

    E5520-K Omnipure Water Filter

    $19.79
    MSRP: $25.99
    Save 24%
  • E5722-P Omnipure Carbon Block Water Filter

    E5722-P Omnipure Carbon Block Water Filter

    $33.99
    MSRP: $49.99
    Save 32%
  • US-UF3 Culligan Ultrafiltration Drinking Water System
  • US-UF3R Culligan Ultrafiltration Replacement Water Filter Cartridge Set
  • 3M Aqua-Pure AP510 Water Filter System

    AP510 3M Aqua-Pure Water Filtration System

    $141.99
    MSRP: $146.04
    Save 3%
  • WHADVS5/WHED20 Whirlpool Undersink Water Filtration System

Items 193 to 240 of 272 total

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