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$109.99
$17.20
$51.99
$75.99
$11.09
$24.69
$15.99
$17.54
$45.99
$23.69
$69.99
$30.69
$20.09
$29.09
$35.99
$68.99
$95.99
$125.99
Out of Stock
$75.99
$39.39
iSpring 4.5x10 in. 5 micron Big Blue Carbon Block (CTO) Water Filter Replacement Cartridge for Under Sink and Whole House Water Filtration Systems, Pack of 4 (FC15BX4)

Using quality coconut shell carbon and highly compact fabrication tech, this activated carbon block CTO(Chlorine, Taste, and Odor) filter cartridge is designed and produced to achieve filtration efficiency and long filter life for 10" Whole House and Undersink Water Filtration Systems. Free of surfactants, binders, and adhesives. No leaching carbon ash.

Knocks out cloudiness as well as bad tastes and odors, removes up to 99% of chlorine, and is effective on herbicides and industrial solvents and other contaminants like trihalomethanes. Steady flow and high absorption.

Each cartridge filters up to 50,000 gallons depending on the use and feed water quality. Replace the filter every 6 months or every 50,000 gallons of water for ideal performance, depending on the quality of source water and daily water consumption.

Fits standard 10"x4.5" filters. Official 2nd stage Carbon Block replacement filter cartridge for iSpring under sink water filter US21B and whole house water filtration system WGB21B; 1st stage for WGB21BM and WGB21B-PB. All 4 cartridges are individually sealed for freshness.

Your iSpring shopping experience is backed by a 30-day money-back guarantee, extended warranty upon registration, and lifetime tech support from iSpring in Atlanta, GA at (678) 261-7611.


$109.99
iSpring FC15 Standard 10 inch CTO Carbon Block Water Filter Cartridge Replacement, 5 Microns (FC15)
  • Reduces fine sediment and chlorine taste and odor in residential and commercial drinking water
  • Rated at 5 microns
  • Bonded Pac media with polyolefin pre-filter and polyethylene netting
  • Initial pressure drop of 3.4 psi at a flow rate of 1 gpm
  • Water temperature range of 40 to 180 degrees F (4.4 to 82.2 degrees C)
  • $17.20
    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 (FC25B)
  • 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.
  • $51.99
    iSpring FC25BX2 20” x 4.5” Water Filter Replacement Cartridges - CTO Carbon Block - Fits Standard 20” x 4.5” Whole House Water Filter Systems - Reducing up to 99% Chlorine - Pack of 2 (FC25BX2)
  • 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.
  • $75.99
    iSpring FP15 5 Micron 10"x2.5" Standard Sediment Water Filter Filter Cartridges (FP15)
  • Multi-layer gradient design
  • 2. 5 inch (O. D) x 10 inch (length) x 1 1/8 inch (I. D), fits industry standard 10 inch filter housings
  • Good for ro, counter-top, whole-house water filters and ice machine, film, beverage processing
  • Genuine filter cartridge Supply
  • $11.09
    iSpring FP15Q Quick-Change 5 micron Sediment Filter, Fits CU-A4 Ultra Filtration System (FP15Q)
  • Made of Melt-Blown Polypropylene, 4-layer filtration
  • 1/4" Quick-Change Fitting
  • Individually wrapped
  • Capable to work at low water pressure
  • $24.69
    iSpring FP15US Universal Sediment Water Filter Cartridges for Reverse Osmosis RO and Under Sink Water Filtration Systems, 5 Micron, 10" x 2.5", Made in USA. (FP15US)
  • Individually wrapped, universal sized 10” x 2.5”, sediment replacement filter cartridge for iSpring PH100, RO100 and most industry standard 10” reverse osmosis RO and under sink systems.
  • Made in the USA. This polypropylene sediment filter removes unwanted particles like dirt and iron rust.
  • Average Filter Life: 6 -12 months, depending on your source water and usage.
  • We offer tech and customer service support by phone or email from our Georgia, USA location. Contact our knowledgeable team for help with product selection that fits your specific water filtration needs and after-sale support to simplify your user experience. We are happy to be here to support our customers now and in the years to come.
  • $15.99
    iSpring FP15X2 5 Micron 10"x2.5" Standard Sediment Water Filter Replacement Cartridge, 2-Pack (FP15X2)
  • Made of 100% Melt-Blown Polypropylene, multi-layer filtration
  • Fits standard 10" housings, including brand name models
  • Each filter last 3 - 6 months depending on water quality and volume
  • 2 replacement cartridges included.
  • $17.54
    iSpring FP15X25 5 Micron Box of 25 10"x2.5" Standard Sediment Water Filter Replacement Cartridge, 25-Pack (FP15X25)
  • Made of 100% Melt-Blown Polypropylene, multi-layer filtration
  • Diameter 2.5" x 10" Length
  • 5 Micron - 25 filters included
  • Fits 10" filter housings
  • Tested by independent third-party to meet NSF/ANSI standard
  • $45.99
    iSpring FP15X4 5 Micron 10" x 2.5" Standard Sediment Water Filter Replacement Cartridges, 4-Pack (FP15X4)
  • Multi-layer gradient design
  • 2. 5 inch (O. D) x 10 inch (length) x 1 1/8 inch (I. D), fits industry standard 10 inch filter housings
  • Good for ro, counter-top, whole-house water filters and ice machine, film, beverage processing
  • Manufacturer direct sale - genuine high quality filter cartridge supply
  • Tech support from Atlanta GA (678)261-7611 M-F 9-5 EST
  • $23.69
    iSpring FP15X50 5 Micron Box of 50 10"x2.5" Standard Sediment Water Filter Replacement Cartridges, 50-Pack (FP15X50)
  • Made of 100% Melt-Blown Polypropylene, multi-layer filtration
  • Diameter 2.5" x 10" Length
  • 5 Micron - 50 filters included
  • Fits 10" filter housings
  • Tested by independent third-party to meet NSF/ANSI standard
  • $69.99
    iSpring FP15X8 5 Micron 10"x2.5" Standard Sediment Water Filter Replacement Cartridges, 8-Pack (FP15X8)
  • Multi-layer gradient design
  • 2. 5" (O. D) x 10" (Length) x 1 1/8" (I. D), Fits industry standard 10" filter housings
  • Good for RO, Counter-top, Whole-house water filters and ice machine, film, beverage processing
  • Genuine filter cartridge supply
  • Tech support from Atlanta GA (678)261-7611(M-F 8;30-5:30 EST)
  • $30.69
    iSpring FP25 20” x 2.5” Water Filter Replacement Cartridges - Fine Sediment Filter - 5 Micron - Fits Standard 20” x 2.5” Water Filtration Systems (FP25)
  • Protect Your Family and Household Appliance from Sediments: The FP25 sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 2.5” housings, including brand name models.
  • The FP25 polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 30,000 gallons of water, enough to supply a family of four with clean water for half a year (depending on your water quality). Water flow: up to 12 GPM.
  • Peace of Mind Customer Service: Register online to activate your extended 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.
  • $20.09
    iSpring FP25B High Capacity 20” x 4.5” Water Filter Replacement Cartridge - Fine Sediment Filter - 5 Micron - Fits Standard 20” x 4.5” Whole House Water Filtration Systems - Pack of 1 (FP25B)
  • Protect Your Family and Household Appliance from Sediments: The FP25B sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 4.5” housings, including brand name models.
  • The FP25B high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year (depending on your water quality). 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.
  • $29.09
    iSpring FP25BX2 High Capacity 20” x 4.5” Water Replacement Cartridges Big Blue Fine Sediment Filters, 2 pieces / 5 microns (FP25BX2)
  • Protect Your Family and Household Appliance from Sediments: The FP25B sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 4.5” housings, including brand name models.
  • The FP25B high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year (depending on your water quality). 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.
  • $35.99
    iSpring FP25BX4 20” x 4.5” Water Filter Replacement Cartridges - Fine Sediment Filters - 5 Micron - Fits Standard 20” x 4.5” Whole House Water Filtration Systems - Pack of 4 (FP25BX4)
  • Protect Your Family and Household Appliance from Sediments: The FP25B sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 4.5” housings, including brand name models.
  • The FP25B high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year (depending on your water quality). 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.
  • $68.99
    iSpring FP25BX6 20” x 4.5” Water Filter Replacement Cartridges - Fine Sediment Filters - 5 Micron - Fits Standard 20” x 4.5” Whole House Water Filtration Systems - Pack of 6 (FP25BX6)
  • Protect Your Family and Household Appliance from Sediments: The FP25B sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 4.5” housings, including brand name models.
  • The FP25B high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year (depending on your water quality). 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.
  • $95.99
    iSpring FP25BX8 20” x 4.5” Water Filter Replacement Cartridges - Fine Sediment Filters - 5 Micron - Fits Standard 20” x 4.5” Whole House Water Filtration Systems - Pack of 8 (FP25BX8)
  • Protect Your Family and Household Appliance from Sediments: The FP25B sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 4.5” housings, including brand name models.
  • The FP25B high capacity polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 100,000 gallons of water, enough to supply a family of four with clean water for a full year (depending on your water quality). 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.
  • $125.99
    iSpring FP25X25 High Capacity 20” x 2.5” Water Filter Replacement Cartridges - Fine Sediment Filter - 5 Micron - Fits Standard 20” x 2.5” Water Filtration Systems - Pack of 25 (FP25X25)
  • Protect Your Family and Household Appliance from Sediments: The FP25 sediment filters are specially designed to remove sediments, dust, sand, large particles, silt, dirt, and rust from water. They are usually used as the first stage of a water filtration system to prevent the filters that follow from getting clogged too soon.
  • Standard Size: Our filter fits standard 20” x 2.5” housings, including brand name models.
  • The FP25 polypropylene sediment filter is able to achieve filtration down to 5 microns. The filters are tested by an independent third-party to meet NSF/ANSI standards. They have a capacity of 30,000 gallons of water, enough to supply a family of four with clean water for half a year (depending on your water quality). Water flow: up to 12 GPM.
  • Peace of Mind Customer Service: Register online to activate your extended 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.
  • Out of Stock
    $75.99
    iSpring Whole House Transparent Water Filter Housing 10-Inch 3/4-Inch FNPT Inlet/Outlet with 1 x 5 Micron Sediment Filters (HC16FP15X1)
  • Size: 3/4" Stainless Steel Reinforced Inlet/Outlet Connectors
  • Fits 10"x2.5" Standard Filter Cartridges
  • Helps to Protect Residential Appliances and Home Pluming from Sediment, Rust, Scale, Dirt, Coarse Sand, Sand, Silt, Bad Taste, Odor, Aesthetic and Chlorine Taste (depending on filter cartridge)
  • Tested by Independent Third-Party to Meet NSF/ANSI standard
  • Lifetime support from iSpring in Alpharetta, GA at (678) 261-7611
  • $39.39
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