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$109.99
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$209.99
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 F2WGB21B Whole House 4.5"x10" Water Filtration Big Blue Sediment and CTO Carbon Block Water Filter Replacement Cartridge Pack Set for WGB21B (F2WGB21B)
  • iSpring 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 quality coconut shell carbon and compact fabrication tech, iSpring CTO filter(FC15B) 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.

  • This filter pack can filter up to 50,000 gallons depending on the use and feed water quality. Replace the filters every 3-6 months to achieve ideal performance. Fine PP sediment filter and quality CTO filter not only bring clean and refreshing water to every faucet in your home, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.

  • This filter pack consists of 1x 10"x4.5"Sediment Filter(FP15B) and 1x 10"x4.5" CTO filter(FC15B). Fits standard 10" big blue whole house water filtration systems. Individually sealed for freshness.

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

Out of Stock
$49.99
iSpring F2WGB21BM Whole House 4.5"x10" Water Filtration Big Blue CTO Carbon Block and Iron and Manganese Reducing Water Filter Replacement Cartridge Pack Set (F2WGB21BM)
  • [Great Compatibility] As the official replacement filter set for iSpring whole house water filtration system WGB21BM, this filter pack consists of one 10"x4.5" CTO carbon block filter(FC15B) and one 10"x4.5" iron and manganese reducing water filter(FM15B). Fits standard 10"x4.5” big blue whole house water filtration systems.
  • [Highly Activated Carbon Block CTO Filter] Using high quality coconut shell carbon and highly compact fabrication tech, iSpring CTO filter FC15B 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.
  • [Iron and Manganese Reducing] 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). Together with 1st stage carbon block filter FC15B, this filter meets your water filtration needs to protect your family and household appliances from iron, manganese, and more.
  • [Easy Filter Change] Individually sealed for freshness. Depending on source water quality, replace the filters every 6 months to achieve optimal performance. Please refer to our manual and our helpful YouTube videos for filter change tips if needed.
  • [TDS Note] The system this filter pack works for is installed at the main water supply line in order to treat all the water in your home. 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 such as RO500, RCC7, RO100 and more.
  • [Peace-of-mind Customer Support] Your risk-free shopping experience is backed by a 30-day money-back guarantee, extended manufacturer warranty, and lifetime tech support from iSpring in Atlanta, GA.
  • $69.99
    iSpring F2WGB21BPB Whole House 4.5"x10" Water Filtration Big Blue CTO Carbon Block and Lead Reducing Water Filter Replacement Cartridge Pack Set (F2WGB21BPB)
  • [Great Compatibility] As the official replacement filter set for iSpring whole house water filtration system WGB21B-PB, this filter pack consists of one 10"x4.5" CTO carbon block filter(FC15B) and one 10"x4.5" lead reducing water filter(FCRC15B). Fits standard 10"x4.5” big blue whole house water filtration systems.
  • [Highly Activated Carbon Block CTO Filter] Using high quality coconut shell carbon and highly compact fabrication tech, iSpring CTO filter FC15B 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.
  • [Lead Reducing] 2nd stage 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. Together with 1st stage carbon block filter FC15B, this filter meets your water filtration needs to protect your family and household appliances from iron, lead, and more.
  • [Easy Filter Change] Individually sealed for freshness. Depending on source water quality, replace the filters every 6 months to achieve optimal performance. Please refer to our manual and our helpful YouTube videos for filter change tips if needed.
  • [TDS Note] The system this filter pack works for is installed at the main water supply line in order to treat all the water in your home. 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 such as RO500, RCC7, RO100 and more.
  • [Peace-of-mind Customer Support] Your risk-free shopping experience is backed by a 30-day money-back guarantee, extended manufacturer warranty, and lifetime tech support from iSpring in Atlanta, GA.
  • $99.99
    iSpring F4WGB21B Whole House 4.5"x10" Water Filtration Big Blue Sediment and CTO Carbon Block Water Filter Replacement Cartridge Pack Set for WGB21B (F4WGB21B)
    • iSpring 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 quality coconut shell carbon and compact fabrication tech, iSpring CTO filter(FC15B) 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.

    • This filter pack can filter up to 100,000 gallons depending on the use and feed water quality. Replace the filters every 3-6 months to achieve ideal performance. Fine PP sediment filter and quality CTO filter not only bring clean and refreshing water to every faucet in your home, but also help prolong the lives of your water-using appliances and protect plumbing from sediment and scale buildup.

    • This filter pack consists of 2x 10"x4.5"Sediment Filters(FP15B) and 2x 10"x4.5" CTO filters(FC15B). Fits standard 10" big blue whole house water filtration systems. Individually sealed for freshness.

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

    Out of Stock
    $89.99
    iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink Water Filter and Whole House Water Filtration Systems, 4.5" x 10" (FC15B)

    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.

    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" big blue whole house and undersink water filtration systems. Official 2nd stage Carbon Block replacement filter cartridge for iSpring Under Sink Water Filtration System US21B as well as Whole House Water Filtration System WGB21B; 1st stage replacement filter cartridge for WGB21BM and WGB21B-PB. Individually sealed for freshness.

    Your worry-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 FM15B Iron and Manganese Reducing Water Filter, Replacement Cartridge for WGB21BM, 10"x 4.5" Big Blue (FM15B)
  • iSpring 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). Fits iSpring whole house water filtration system WGB21BM and most whole house systems that use 10" x4.5" filters.
  • Feed water pressure: 20 - 100 psi. Pressure impact: up to 5 psi drop at a flow rate of 8. GPM Flow Rate: 4 - 8 GPM .
  • Stable performance at a wider pH range 5.8 - 8.6 and temperature range 40 - 113°F. Filter life: 30,000 gallons at 3.0 ppm iron level.
  • Manufactured to comply strictly with FDA standards and tested by independent third party against NSF/ANSI standards.
  • Register online to activate your extended manufacturer warranty and lifetime 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!
  • $59.99
    iSpring FP15B Big Blue Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems, High Capacity 5-Micron Premium PP, 4.5" x 10" (FP15B)
  • A combination of a sparse layer, compaction layer, and precision layer ensures this iSpring 5-micron polypropylene sediment filter captures dirt, sand, silt, dust, rust, and scale particles effectively.
  • Filters up to 15,000 gallons depending on the use and feed water quality. Replace the filter every 3-6 months to achieve ideal performance.
  • Combining with other filters such as CTO filter(FC15B), iSpring fine PP sediment filter not only brings clean and refreshing water to every faucet in your home but also helps to prolong the lives of your appliances and protects plumbing from sediment and scale buildup.
  • Official 1-stage sediment filter for iSpring whole house water filtration system WGB21B. Fits standard 10" x 4.5" big blue whole house water filtration systems. Individually sealed for freshness.
  • Your worry-free shopping experience is backed by a 30-day money-back guarantee and lifetime tech support from iSpring in Atlanta, GA at (678) 261-7611.
  • Out of Stock
    $21.60
    iSpring HB18B Water Filter Housing 10" X 4.5" in. Big Blue, 1-in. NPT Ports (HB18B)
  • Pressure Release Button
  • 1" inlet/outlet
  • Package includes wrench to open and tighten the housings
  • Fit standard size filtration replacement cartridges: 4.5"x10"
  • Maximum Temperature: 100DegreeF (37.8DegreeC) Maximum Pressure: 90 psi (6.2 bar)
  • Cartridges are recommended to change every 6 months (not included)
  • $45.99
    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 Filtration] 1st-Stage 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 pesticides, herbicides, and industrial solvents.
  • [Excellent 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(up to 15GPM) with less pressure loss. Fine PP sediment filter and high 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.
  • [Peace-of-mind 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 Atlanta, 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 Water Filtration] 1st-Stage 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 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 effective on herbicides and industrial solvents.
  • [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 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 water for the entire family.
  • [Peace-of-mind 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.
  • [Quality Filters] The first stage CTO Carbon Block filter(FC15B) is made of high quality coconut shell carbon for filtration efficiency and long 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 little impact on water flow (up to 15 GPM) and requires little maintenance.
  • [Peace-of-mind 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 Atlanta, 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 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 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 little maintenance.
  • [High Quality] The first stage CTO Carbon Block filter is made of high-quality coconut shell carbon for filtration efficiency and long 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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