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iSpring FC15B 5-Micron Universal Premium Coconut Shell High Capacity Activated CTO Carbon Block Water Filter Replacement Cartridge for Whole House Water Filtration Systems, 4.5" x 10" (FC15B)

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

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

[Long Filter Life] 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 optimal performance, depending on the quality of source water and daily water consumption.

[Great Compatibility] Fits standard 10"x4.5" big blue whole house water filtration systems. Official 2nd stage Carbon Block replacement filter cartridge for iSpring whole house water filtration system WGB21B and 1st stage replacement filter cartridge for WGB21BM and WGB21B-PB. Individually sealed for freshness.

[Peace-of-mind Customer Support] Your risk-free 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.


$35.39
iSpring US21B Heavy Duty 2-Stage Undersink Water Filtration System with 10” x 4.5” Premium Quality GAC and Super Capacity CTO Carbon Block Filters, Max Flow 1” Ports, Direct Connect Hoses Included (US21B)
  • [Heavy Duty Water Filter System] Made of high quality material for all components and equipped with premium big blue 10” x 4.5” filters, iSpring US21B is your best bet for safe, clean, and healthy water for drinking and cooking right from your tap. This heavy duty undercounter water filter system is designed to provide you and your loved ones with a continuous on-demand supply of refreshing filtered water whenever your kitchen faucet is on. No waste water. No tank taking up your under sink space.
  • [High Capacity Filters] 1st stage GAC carbon filter(FG15B-KS) and 2nd stage CTO carbon block filter(FC15B) effectively remove up to 99% of contaminants, including chlorine, lead, mercury, organic compounds, and many other heavy metals. They also tackle problems like turbidity, cloudiness, colors, bad taste, and odors(e.g. 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 Water Flow] Thanks to the system’s connection design and its 1” inlet and outlet ports, you will experience less waiting time when filling up your glasses, pitcher, coffee pot, or cooking pots as the peak water flow rate is up to 15 GPM. Based on the contaminant levels in source water and your water use, we suggest that you change your filters every 6-12 months for best filtration performance.
  • [Super Easy DIY Installation] Comes with two 24-inch DIRECT CONNECT hoses that connect the system to the existing under sink incoming water supply and the cold water line of your kitchen faucet. Unlike reverse osmosis systems, you don’t need to spend time drilling a hole on your countertop for a RO faucet. Tool free. No mess. System installation and filter cartridge replacement are a breeze!
  • [TDS Note] Please be noted that the system 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.
  • $193.99
    iSpring WGB21B 2-Stage Heavy Duty Whole House Water Filtration System, 10"x4.5" Big Blue Sediment Filter and CTO(Chlorine, Taste, and Odor) Filter, 1" Inlet/Outlet (WGB21B)
  • [Two-Stage Effective Filtration] 1st-Stage premium 5-micron polypropylene sediment filter (FP15B) captures dirt, sand, silt, dust, rust, and scale particles and extends the life of CTO carbon block filter. Using high quality coconut shell carbon and highly compact fabrication tech, 2nd-stage CTO filter(FC15B) knocks out cloudiness as well as bad tastes and odors, removes over 90% of chlorine, and is highly effective on VOCs like pesticides, herbicides, and industrial solvents.
  • [Superb Filtration Capacity] 10"x4.5" replaceable whole house water filters can provide up to a full year of clean water(up to 50,000 gallons) for a family of four. 1-inch inlet and outlet ports allow fast water flow with less pressure loss. Fine PP sediment filter and premium quality CTO filter not only bring clean and fresh water to every faucet in your house, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.
  • [Easy Installation and Filter Change] The system comes pre-assembled onto the mounting bracket for a streamlined, DIY installation. Filter wrench included to make routine filter changes easy and quick. A pressure release valve allows for the release of built-up pressure when changing filters. Refer to our manual and/or YouTube videos to Install this point-of-entry (POE) filtration system at the main water supply to get clean and healthy water for the entire family.
  • [Top-Notch Customer Service] Backed by a 30-day money-back guarantee and extended manufacturer warranty upon warranty registration at iSpring. Lifetime tech support(678-261-7611) from Alpharetta, GA USA.
  • [TDS Note] Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.
  • $165.99
    iSpring WGB21B+AH12MN16X2 2-Stage Whole House Water Filtration System with 3/4 inch Push-Fit Braided Stainless Steel Hose Connectors and Ball Valve (WGB21B+AH12MN16X2)
  • [Two-Stage Effective Filtration] 1st-Stage premium 5-micron polypropylene sediment filter (FP15B) captures dirt, sand, silt, dust, rust, and scale particles and extends the life of CTO carbon block filter. Using high quality coconut shell carbon and highly compact fabrication tech, 2nd-stage CTO filter(FC15B) knocks out cloudiness as well as bad tastes and odors, removes over 90% of chlorine, and is highly effective on organic compounds such as herbicides, industrial solvents.
  • [Superb Filtration Capacity] 10"x4. 5" replaceable whole house water filters can provide up to a full year of clean water(up to 50, 000 gallons) for a family of four. 1-inch inlet and outlet ports allow fast water flow with less pressure loss. Fine PP sediment filter and premium quality CTO filter not only bring clean and fresh water to every faucet in your house, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.
  • [Easy Installation and Filter Change] Comes pre-assembled onto the mounting bracket for a streamlined, DIY installation. Two 3/4" Push-Fit Braided SS Hose Connectors included. Wrench included for easy and quick filter changes. A pressure release valve allows for the release of built-up pressure when changing filters. Refer to our manual and YouTube videos to Install this point-of-entry(POE) filtration system at the main water supply to get clean and healthy water for the entire family.
  • [Top-Notch Customer Service] Backed by a 30-day money-back and extended manufacturer upon registration at iSpring. Lifetime tech support(678-261-7611) from Atlanta, GA USA.
  • [TDS and Filter Pack Note] Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems. Value filter packs(F2WGB21B or F4WGB21B) available to meet your filter change needs.
  • $220.99
    iSpring WGB21B-PB 2-Stage Lead Reducing Whole House Water Filtration System w/ 10” x 4.5” Big Blue Carbon Block Filter FC15B and Lead Reducing Filter FCRC15B (WGB21B-PB)
  • [ Protect Your Family and Household Appliance from Lead and More] Our 2nd stage filter (FCRC15B) lead removal filter is specially designed for reducing lead. This filter features a high filtration capacity of 80, 000 gallons of lead-loaded water, effectively reducing lead level from as high as 100 ppb to 15 ppb (the EPA standard for drinking water) and less.
  • [Premium Quality] The first stage CTO Carbon Block filter(FC15B) is made of high quality coconut shell carbon for maximum filtration efficiency and filter life. It is tested by an independent third-party to meet NSF/ANSI standards. The filter has a capacity of 50,000 gallons of water, enough to supply a family of four with clean water for half a year.
  • [DIY Installation and Maintenance] Refer to our manual and our helpful YouTube videos for easy DIY installation to splice in this Point-of-Entry (P.O.E.) system into your home's main water line. With 1” NPT inlet/outlet and Big Blue 10” x 4.5” filter cartridges, the system has minimum impact on water flow (up to 15 GPM) and requires minimum maintenance.
  • [Top-Notch Customer Service] Backed by a 30-day money-back guarantee and extended manufacturer warranty upon warranty registration at iSpring. Lifetime tech support(678-261-7611) from Alpharetta, GA USA.
  • [TDS Note] Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS), and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, please consider our iSpring RO systems.
  • $259.99
    iSpring WGB21BM 2-Stage Iron and Manganese Reducing Whole House Water Filtration System w/ 10” x 4.5” Big Blue Filters, 1" Ports (WGB21BM)
  • [Two-Stage Effective Filtration] Our featured 2nd stage filter (FM15B) is specially designed for iron & manganese removal, reducing iron (Max 3.0 ppm down to 0.01 ppm) and manganese (Max 1.0 ppm down to 0.01 ppm). Using high quality coconut shell carbon and highly compact fabrication tech, 1st-stage CTO filter(FC15B) knocks out cloudiness as well as bad tastes and odors, removes over 90% of chlorine, and is highly effective on VOCs like herbicides and industrial solvents. iSpring WGB21BM is THE system you need to protect your family and household appliance from iron, manganese, and more.
  • [Easy Installation and Filter Change] The system comes pre-assembled onto the mounting bracket for a streamlined, DIY installation. Filter wrench included to make routine filter changes easy and quick. Refer to our manual and our helpful YouTube videos to install this point-of-entry (POE) filtration system at the main water supply to get clean and healthy water for the entire family. With 1” NPT inlet/outlet and Big Blue 10” x 4.5” filter cartridges, the system has a minimum impact on water flow (up to 15 GPM) and requires minimum maintenance.
  • [Top-Notch Quality] The first stage CTO Carbon Block filter is made of high-quality coconut shell carbon for maximum filtration efficiency and filter life. It is tested by an independent third-party to meet NSF/ANSI standards. The iron and manganese reducing filter lasts up to 3 times longer than greensand due to the catalytic media not being consumed in the process. Those filters have a filtration capacity of up to 50,000 gallons of water, enough to supply a family of four with clean water for up to a year.
  • [Peace-of Mind Customer Service] Backed by a 30-day money-back guarantee, 1-year warranty, and extended manufacturer warranty upon warranty registration at iSpring. Lifetime tech support(678-261-7611) from Atlanta, GA USA. 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] This system is installed at the main water supply line in order to treat all the water in your home. For well/pond water with very high iron/manganese please contact us for customized solutions. Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS) and instead keeps healthy minerals in your water. If you are interested in a filter that removes TDS, please consider our iSpring Reverse Osmosis (RO) systems.
  • $209.99
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