iSpring FC25B 20” x 4.5” Water Filter Replacement Cartridges - CTO Carbon Block - Fits Standard 20” x 4.5” Whole House Water Filtration Systems - Reducing up to 99% Chlorine - Pack of 1

  • Protect Your Family and Household Appliance from Chlorine and More: Say goodbye to smelly, bad tasting water! The FC25B carbon block filter is specially designed to remove up to 99% of chlorine from water as well as taste and odor compounds.
  • Standard Size: Our filter set fits standard 20” x 4.5” housings, including brand name models.
  • Our FC25B CTO Carbon Block filters are made of coconut shell activated carbon to increase filtration efficiency and extend filter life. Activated carbon is an effective adsorbent because it is a porous material and provides a large surface area to which contaminants may adsorb. They are tested by an independent third-party to meet NSF/ANSI standards. Water flow: up to 15 GPM.
  • Peace of Mind Customer Service: Register online to activate your manufacturer warranty and life-time free tech support from U.S. local support team. We stand behind our products and if you encounter any problems with any of our products please reach out to us immediately. We are happy to help!
  • Please Note: The cartridges are individually wrapped to ensure freshness. Please unwrap the cartridges before use. Unlike an RO membrane, the filters don’t reduce Total Dissolved Solids (TDS). If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.
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    $51.99
    Questions & Answers
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    • Our FC25B CTO Carbon Block filters have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year.

    • The FC25B carbon block filters are made of coconut shell carbon and are specially designed to remove up to 99% of chlorine from water as well as various other contaminants that cause unpleasant odors and tastes.

    • Why iSpring

      At iSpring, we provide our customers with professional water solutions to any water concerns you may have.

    • Clean Water For the Ones You Love

      Save on your water bill - the filters won’t produce any wastewater.

      The filters are specially designed for a water flow: up to 15 gallons per minute.

      Unlike an RO membrane, the filters don’t reduce Total Dissolved Solids (TDS). If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.


    Product Features


    Size:4.5" x 20"

    Usually used as the second stage for 20 in. Big Blue whole house filters. The carbon block filter is manufactured using a continuous extrusion process. It consists of Activated Carbon. It is effective in reducing free chlorine, bad taste, odor, hazardous chemicals, and pesticides. Depending on the inlet water quality or flow rate, it needs to be replaced every 6-12 months or 100,000 Gal. of water.


    • Availability: In Stock
    • Model: FC25B
    • Manufacturer: iSpring