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20 x 4.5 Inch Carbon Filters

Save on Replacement Whole House Water Filters at DiscountFilterStore.com


Get improved taste and clarity from just about every faucet around the home with a new whole house water filter cartridge. Below you’ll find a variety of whole house water filter cartridges with a broad range of filter life’s, flow rates, micron ratings, and filter medias. Therefore, no matter what type of whole house water filter system you have or what type of whole house water filter cartridge you’re looking for, you’ll find a water filter cartridge designed to fit both your needs and your system. Choose from over 400+ OEM whole house water filter cartridges in stock, from some of the industry’s top manufacturers, many of which are versatile and designed to fit into a variety of other whole house water filter systems. See all of our whole house water filter products. For added protection and even cleaner, consider adding a reverse osmosis water filter system or a UV water purification system to your existing whole house water filter line.



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  1. WRC25HD20 American Plumber Whole House 20-inch Heavy Duty Filter Cartridge

    WRC25HD20 American Plumber Whole House 20-inch Heavy Duty Filter Cartridge

    Fits American Plumber W2010-PR and W2015-PR and most other heavy duty water filter housings Learn More
    $69.99 MSRP:  $78.19
  2. RFC20-BB Pentek Carbon Filter Replacement Cartridge

    RFC20-BB Pentek Replacement Filter Cartridge

    Fits most Big Blue housings that accept 20-inch x 4.5-inch water filter cartridges Learn More

    As Low As $52.16 Per Filter

  3. GAC20-BB Pentek Whole House Water Filter

    GAC20-BB Pentek Whole House Filter Replacement Cartridge

    Fits any heavy duty housing that uses 20-inch x 4 1/2-inch replacement filter cartridges Learn More

    As Low As $0.00 Per Filter

  4. EPM-20BB Pentek Whole House Filter Cartridge

    EPM-20BB Pentek Whole House Filter Replacement Cartridge

    Fits Pentek 20-inch Big Blue and other heavy-duty filter housings Learn More

    As Low As $43.66 Per Filter

  5. EP-20BB Pentek Replacement Water Filter

    EP-20BB Pentek Replacement Filter Cartridge

    Fits most Big Blue housings that accept 20-inch x 4.5-inch water filter cartridges Learn More

    As Low As $63.08 Per Filter

  6. C2-02 Viqua Carbon Whole House Filter

    C2-02 Viqua Carbon Whole House Filter

    Fits most 20 x 4.5-inch filter housings including the Viqua IHS12-D4 and IHS22-D4 water disinfection systems. Learn More
    $49.99 MSRP:  $89.00
  7. GAC20-BB Pentek Replacement Granular Activated Carbon Filter by Tier1

    GAC20-BB Pentek Replacement Granular Activated Carbon Filter by Tier1

    Fits most water filter housings that require a 20-inch x 4.5-inch filter cartridge Learn More
    $62.99
  8. F-20-2215 Aries Polypropylene Sediment Water Filter Replacement by Tier1
  9. AF-20-2015-BB Tier1 Aries Comparable KDF and Carbon Water Filter

    AF-20-2015-BB Tier1 Aries Comparable KDF and Carbon Water Filter

    Fits water filtration systems that accept 20 x 4.5 inch cartridges, including the #20 Big Blue and Big Boy housings by Pentek Learn More
    $121.99
  10. FXB20RFL Filtrex Green Radial Flow Water Filter Cartridges
  11. CQE-RC-04036 Crystal Quest Carbon Block Water Filter Cartridge

    CQE-RC-04036 Crystal Quest Carbon Block Water Filter Cartridge

    Fits Crystal Quest countertop, undersink and refrigerator water filtration systems Learn More
    $49.99 MSRP:  $52.34
  12. CBC20-BB Pentek Replacement Filter Cartridge

    CBC20-BB Pentek Replacement Filter Cartridge

    Fits most housings that accept 20-inch x 4.5-inch water filter cartridges Learn More
    $114.17
  13. MATRIKX-Pb1-HD20 KX Technologies MatrikX Whole House Filter Replacement Cartridge

    MATRIKX-Pb1-HD20 KX Technologies MatrikX Whole House Filter Replacement Cartridge

    Fits any standard housing that uses 20-inch x 4 1/2-inch replacement filter cartridges Learn More
    $123.99
  14. MATRIKX-CTO2-HD20 KX Technologies MatrikX Whole House Filter Replacement Cartridge

    MATRIKX-CTO2-HD20 KX Technologies MatrikX Whole House Filter Replacement Cartridge

    Fits any standard housing that uses 20-inch x 4 1/2-inch replacement filter cartridges Learn More
    $68.99 MSRP:  $69.29
  15. CB-45-2010 Hydronix Replacement Filter Cartridge

    CB-45-2010 Hydronix Replacement Filter Cartridge

    Fits most Big Blue housings that accept 20-inch x 4.5-inch water filter cartridges Learn More
    $48.99 MSRP:  $58.99
  16. 22006 Hydrologic BigBoy Replacement Carbon Filter - Green
  17. 3M Aqua-Pure AP817-2 Whole House Water Filter Cartridge

    AP817-2 3M Aqua-Pure Whole House Filter Replacement Cartridge

    Fits 3M Aqua-Pure whole house water filter systems Learn More
    $85.99 MSRP:  $112.69
  18. EP-20BB 155583-43 Pentek Carbon Filter Cartridge Comparable Replacement Kit with O-ring and Lubricant by Tier1

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