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FC15BX4 4.5x10 in. 5 micron Carbon Block (CTO)
$115.99
us made water filter
$23.99
ispring box 25 cto carbon block water filter replacement cartridge compare kx matrikx pentek omniwater filter replacement cartridge hydronix
$165.99
carbon block filter
$35.99
FC25B High Capacity 20” x 4.5” Water Filter Replacement Cartridge
$61.99
carbon filters
$83.99
$49.99
FCB500 Carbon Block Filter Replacement for RO500 Tankless Reverse Osmosis Water Filtration System
$29.99
iSpring FCF500 Replacement Filter for RO500 Tankless Reverse Osmosis Water Filtration System
$39.99
wgb21b-pb replacement filter
$85.99
lead filter cartridge
$149.99
countertop water filter cartridge
$39.99
$27.99
$79.99
df1 replacement filter
$12.99
2.5
$20.99
us21b filter replacement cartridge
$57.99
us made water filter
$27.99
ispring box 25 gac granular activated carbon water filter replacement cartridge
$139.99
granular activated carbon filter
$32.09
FC15BX4 4.5x10 in. 5 micron Carbon Block (CTO)
iSpring FC15BX4 4.5x10 in. 5 micron 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.


$115.99
us made water filter
iSpring FC15US Coconut Shell Activated Carbon Block CTO Filter Replacement Cartridge for RO & Under Sink Water Filtration System, 10" x 2.5" (FC15US)
  • Individually wrapped, universal sized 10” x 2.5”, activated carbon block (CTO, Chlorine, Taste, and Odor) replacement filter cartridge for iSpring PH100, RO100 and most industry standard 10” reverse osmosis RO and under sink systems.
  • Made in the USA. This activated carbon block filter traps and absorbs chemicals and chlorine from the water.
  • This activated carbon block CTO filter cartridge uses coconut shell carbon and compact fabrication tech.
  • 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.
  • $23.99
    ispring box 25 cto carbon block water filter replacement cartridge compare kx matrikx pentek omniwater filter replacement cartridge hydronix
    iSpring FC15X25 Box of 25 CTO Carbon Block Water Filter Replacement Cartridge (FC15X25)
  • Individually wrapped, packed in 25 pcs per carton
  • 5 micron Rating
  • Made from coconut shell carbon
  • Fits 10" standard filter housings
  • Removes Chlorine and Organic chemicals
  • $165.99
    carbon block filter
    iSpring FC25 High Capacity 20” x 2.5” Water Filter Replacement Cartridges - CTO Carbon Block - Fits WCB32C, WCB32O, and RCB3P (FC25)
  • Protect Your Family and Household Appliance from Chlorine and More: Say goodbye to smelly, bad tasting water! The FC25 carbon block filter is specially designed to remove up to 99% of chlorine from water as well as various other contaminants that cause unpleasant odors and tastes.
  • Standard Size: Our filter set fits standard 20” x 2.5” housings, including brand name models.
  • Our FC25 CTO Carbon Block filters are made of coconut shell carbon to increase filtration efficiency and extend filter life. They are tested by an independent third-party to meet NSF/ANSI standards. The filters have a capacity of 30,000 gallons of water, enough to supply a family of four with clean water for half a year. 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.
  • $35.99
    FC25B High Capacity 20” x 4.5” Water Filter Replacement Cartridge
    iSpring FC25B High Capacity 20” x 4.5” Water Filter Replacement Cartridge - Carbon Block - Fits Standard 20” x 4.5” Whole House Water Filter Systems (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.
  • $61.99
    carbon filters
    iSpring FC25BX2 20” x 4.5” Water Filter Replacement Cartridges - CTO Carbon Block - Fits Standard 20” x 4.5” Whole House Filter Systems - 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.
  • $83.99
    iSpring FCA500 Carbon Alkaline Filter Replacement Cartridge for RO500 Series Tankless Reverse Osmosis Water Filtration System (FCA500)
  • Dedicated last stage carbon alkaline filter for iSpring RO500 series tankless reverse osmosis system.
  • Made with quality coconut shell activated carbon and minerals.
  • Further polishes the filtered RO water, balances pH level, and enhances the taste with added back minerals.
  • Lasts for up to a full year, depending on the quality of source water and daily water consumption.
  • Quick and easy filter change. No tools required.
  • Backed by a 30-day money-back guarantee with lifetime CS and tech support from Atlanta, GA USA.
  • $49.99
    FCB500 Carbon Block Filter Replacement for RO500 Tankless Reverse Osmosis Water Filtration System
    iSpring FCB500 Carbon Block Filter Replacement for RO500 Tankless Reverse Osmosis Water Filtration System (FCB500)
  • Dedicated last stage carbon block filter for iSpring RO500 tankless reverse osmosis system.
  • Made with quality coconut shell activated carbon block.
  • Further polishes filtered water and enhances the taste of water.
  • Lasts for up to a full year, depending on the quality of source water and daily water consumption. 
  • Quick and easy filter change. No tools required.
  • Backed by a 30-day money-back guarantee with lifetime CS and tech support from Atlanta, GA USA.
  • $29.99
    iSpring FCF500 Replacement Filter for RO500 Tankless Reverse Osmosis Water Filtration System
    iSpring FCF500 Replacement Filter for RO500 Tankless Reverse Osmosis Water Filtration System (FCF500)
  • Dedicated 1st stage replacement filter for iSpring RO500 tankless reverse osmosis system. 
  • Featuring a multi-layer design, 3-in-1 compound filter FCF500 is designed to remove sand, rust, dirt, particles as well as chlorine and unpleasant odor. 
  • Filter life: 6 months*, depending on the quality of source water and daily water consumption. 
  • Quick and easy filter change. No tools required.
  • Backed by a 30-day money-back guarantee with lifetime CS and tech support from Atlanta, GA USA.
  • $39.99
    wgb21b-pb replacement filter
    iSpring FCRC15B Lead Reducing Replacement Water Filter, 10"x4.5" (FCRC15B)
  • This filter (FCRC15B) is specially designed for lead reducing. It features a filtration capacity of up to 80, 000 gallons of water, reducing lead level from 100 ppb to 15 ppb (the EPA standard for drinking water) and less.
  • Being the official 2nd stage filter for iSpring WGB21B-PB, FCRC15B also fits standard 10” x 4.5” housings from most brand name models.
  • The cartridge lasts up to 3 times longer than conventional media. It also has little impact on water flow (up to 15 GPM) and requires little maintenance.
  • Backed by a 30-day money-back guarantee and extended manufacturer warranty upon warranty registration at iSpring. Lifetime tech support(678-261-7611) from Atlanta, GA USA.
  • Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), and instead keeps minerals in your water. If you are interested in a filter that removes TDS, please consider our iSpring RO systems.
  • $85.99
    lead filter cartridge
    iSpring FCRC25B 20” x 4.5” Water Filter Replacement Cartridge Lead Reducing (FCRC25B)
  • Protect Your Family and Household Appliance from Lead: Our filter (FCRC25B) is specially designed for reducing lead. This filter features a capacity of 15, 000 ppm for lead, reducing lead to below 15 ppb (the EPA standard for drinking water).
  • Standard Size: Our filter fits standard 20” x 4. 5” housings, including brand name models.
  • Peace of Mind Customer Service: Register online to activate your manufacturer 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.
  • $149.99
    countertop water filter cartridge
    iSpring FCT10 Replacement Cartridge for CT10 Countertop Multi Filtration Drinking Water Filter Dispensers (FCT10)
  • A drinking water filter cartridge that combines dual-layered sediment filtration, activated carbon, KDF media, and calcite. Official replacement filter cartridge for iSpring countertop drinking water dispenser CT10.
  • Reduces sediment, dust, rust, particles, chlorine, lead, arsenic, heavy metals, and more. Also removes unpleasant chlorine taste and odor.
  • $39.99
    iSpring FD15 DI Deionization Filter RO/Aquarium 10" x 2.5", Clear (FD15)
  • Re-fillable DI filter for RO DI system
  • 2.5" x 10" inline filter
  • Fits most RO DI systems, including brand name models
  • Refill 0 ppm Ion DI(De-Ionized), remove hard water material from the water and create 0-1ppm
  • Reducing TDS level in the water
  • Easy to add-on
  • $27.99
    iSpring FD25B Deionized Water Filter for Spotless Car Wash System, Fits WGB22BD Deionized Water System for Car Wash, 4.5” x 20” (FD25B)
  • [A deionized water filter that produces filtered water with zero or near zero TDS (total dissolved solids)]. iSpring FD25B deionized water filter provides a perfect last step for rinsing your cars, RVs, boats, motorcycles, windows, and more, giving them a shining, bright, and spotless touch.
  • [Standard Size] Our filter set fits any standard water filter housing that requires 20” x 4.5” cartridges. Each cartridge is individually wrapped to ensure that the filter stays fresh. Please unwrap the cartridges before installation.
  • [Built to Last] Your filter changing schedule will be based on your water usage and the contamination level of your source water. We recommend changing your filters when you notice a dramatic increase in the TDS value (~30 ppm). It lasts up to 120 rinses for cars filterster up to 600 gallons of water.
  • [Peace-of-Mind Customer Service] We offer both technical assistance and customer service support by phone or email out of our headquarters in Atlanta, GA. Our knowledgeable team is available to help you find a filtration solution that best solves your specific water concerns or to help with any after-sale support you may need. Our goal is, and always will be, to maximize your user experience.
  • [Please Note] This deionized water filter is not designed for drinking water applications of any kind. TDS in your source water will impact the performance of this filter.
  • $79.99
    df1 replacement filter
    iSpring FDF1 Faucet Filter Replacement Cartridge for DF1/DF2 Series Water Filtration System, 500 Gallons (FDF1)
  • Replacement faucet filter for iSpring DF1/DF2 Faucet Mount Filter System. Get your filtered water right from your tap for drinking, cooking, and washing.
  • iSpring FDF1 faucet filter can reduce chlorine, chloramine, cysts, lead, mercury, lindane, atrazine, and many other contaminants in water from faucets in your kitchen sink, bathroom sink, or RV sink. 
  • Thanks to this filter cartridge, iSpring DF1/DF2 series sink water filter faucet can deliver up to 500 gallons of clean filtered water. This means that you will only need to change your faucet water filter once every 6-8 months. 
  • Up to 1.5 GPM filtration rate; nice and steady flow of water.
  • Easy tool-free change in a few minutes. 
  • 30-day money back guarantee; lifetime tech support from iSpring at (678)261-7611.
  • $12.99
    2.5
    iSpring FG15 GAC Granular Activated Carbon 2.5"x10" Water Filter Replacement, 2.5" x 10" (FG15)
  • Individually wrapped
  • 5 micron rating
  • Made from coconut shell carbon
  • Fits 10 inch standard filter housings
  • Removes chlorine, bad odor and taste
  • $20.99
    us21b filter replacement cartridge
    iSpring FG15B-KS GAC and KDF Carbon Filter Replacement Cartridge for Direct Connect Undersink Water Filtration System US21B, 10” x 4.5” (FG15B-KS)
  • [Superb Filtration Performance] FG15B-KS 10” x 4.5” compound filter is designed to effectively remove chlorine, lead, mercury, hydrogen sulfide, iron, chloride, chloramines, herbicides, odors, and other contaminants or impurities. Capacity: 80000 gallons
  • [Water Health Warrior] Teaming up with carbon filters like iSpring FC15B, this filter is super powerful to remove the unpleasant taste or odor left in chlorinated water while maintaining the protection benefits of chlorine in water disinfection. They also tackle problems like turbidity, cloudiness, colors, bad taste, and odors like hydrogen sulfide that smells like rotten eggs. A reliable shield that protects you and your family from ingesting harmful chemicals or contaminants in your tap water.
  • [Great Compatibility] Official 1st stage replacement filter cartridge for iSpring direct connect Point-of-Use(POU) undersink water filtration system US21B. Fits standard 10" undercounter or whole house water filtration systems. Individually sealed for freshness.
  • [Exceptional Filter Life] Based on the contaminant levels in source water and your water use, we suggest that you change your filters every 8-12 months for best filtration performance. Hassle-free filter cartridge replacement is a breeze!
  • [TDS Note] Please be noted that the system for which this filter works is NOT designed to reduce Total Dissolved Solids(TDS) removal and instead keeps essential minerals in your water. If you are interested in a filter that significantly reduces TDS, please consider our iSpring Reverse Osmosis (RO) systems RCC7 series or tankless RO500.
  • [Peace-of-Mind Support] We offer tech and CS support via phone and email from Atlanta, GA. Contact our responsive and professional team for product selection to suit your water filtration needs and after-sale support to maximize your user experience. Now, and years to come, we will be right here and ready to help.
  • $57.99
    us made water filter
    iSpring FG15US Universal GAC Granular Activated Carbon Filter Replacement Cartridge for RO and Under Sink Water Filtration Systems, 10" x 2.5" (FG15US)
  • Individually wrapped, universal sized 10” x 2.5”, GAC granular activated carbon replacement filter cartridge for iSpring PH100, RO100 and most industry standard 10” reverse osmosis RO and under sink systems.
  • Made in the USA. This granular activated carbon filter traps and absorbs chemicals and chlorine from the water with mechanical filtration and physical absorption.
  • The GAC filter cartridge achieves filtration efficiency and filter life by utilizing coconut shell carbon and compact fabrication tech.
  • 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.
  • $27.99
    ispring box 25 gac granular activated carbon water filter replacement cartridge
    iSpring FG15X25 Box of 25 10"x 2.5" GAC Granular Activated Carbon Water Filter Replacement Cartridge (FG15X25)
  • Individually wrapped, packed in 25 pcs per carton
  • 5 micron Rating
  • Made from coconut shell carbon
  • Fits 10" standard filter housings
  • Removes chlorine, bad odor and taste
  • $139.99
    granular activated carbon filter
    iSpring FG25 20” x 2.5” Water Filter Replacement Cartridges - Granular Activated Carbon - Fits RCB3P RO System and other 20” x 2.5” Systems (FG25)
  • Protect Your Family and Household Appliance from Chlorine and More: Say goodbye to smelly, bad tasting water! The FG25 granular activated carbon filter is specially designed to remove dust, particles, rust, and odors and tastes caused by various contaminants, especially chlorine from your source water.
  • Standard Size: Our filter set fits standard 20” x 2.5” housings, including brand name models.
  • Our FG25 granular activated carbon filters are made of coconut shell carbon to increase filtration efficiency and extend filter life. They are tested by an independent third-party to meet NSF/ANSI standards. The filters have a capacity of 30,000 gallons of water, enough to supply a family of four with clean water for half a year. 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.
  • $32.09
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