4.5x10 Short Big Blue

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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 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 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
    iSpring FG15B-KS GAC and KDF Carbon Filter Replacement Cartridge for Direct Connect Undersink Water Filtration System US21B, 10” x 4.5” (FG15B-KS)
  • FG15B-KS 10” x 4.5” compound filter is designed to remove chlorine, lead, iron, mercury, hydrogen sulfide, THMs, chloride, chloramines, herbicides, nitrate, odors, and other contaminants.
  • Teaming up with carbon filters like iSpring FC15B, this filter removes the unpleasant taste or odor left in chlorinated water. They also tackle problems like turbidity, cloudiness, colors, bad taste, and odors like hydrogen sulfide that smells like rotten eggs.
  • Official 1st stage replacement filter cartridge for iSpring direct connect Point-of-Use(POU) undersink water filtration system US21B. Fits standard 10" big blue undercounter or whole house water filtration systems. Individually sealed for freshness.
  • Based on the contaminant levels in source water and your water use, we suggest that you change your filters every 8-12 months for ideal filtration performance. Hassle-free filter cartridge replacement is a breeze!
  • Please be noted that the system for which this filter works is NOT designed to reduce Total Dissolved Solids(TDS) removal and instead keeps 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.
  • 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.
  • $49.99
    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.
  • $21.60
    iSpring FWDS80K 10” x 4.5” Water Filter Replacement Cartridges - Anti Scale Filter with Patented Scale Inhibitor - Fits Standard 10” x 4.5” Whole House Water Filtration Systems - Pack of 1 (FWDS80K)
  • Protect your household appliances and plumbings from scale. The patented scale inhibitor sequester calcium and magnesium, preventing your pipes from scale and clearing partially clogged piping.
  • Prevent your pipes from corrosion. Our filter media inhibit corrosion, particularly iron, steel, galvanized, copper and lead, by coating the surface of your pipes. The coating also helps to stabilize chlorine as the chlorine will not react with the metal pipe if the coating exists.
  • The filter is made of patented scale inhibitor and is capable of filtering up to 80,000 gallons of water, or lasting for 6 months (depending on inline water quality). The filter is tested by an independent third-party to meet NSF 42/60 standards.
  • Peace of Mind Customer Service: The product is backed by a 30-day money-back guarantee, 1-year manufacturer warranty, and extended warranty upon registration. Lifetime tech support is available at 123Filter.com/warranty, (678) 261-7611, Alpharetta, 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: Unlike an RO system, this system will NOT reduce Total Dissolved Solids (TDS). If you are interested in a filter that removes TDS, consider our iSpring Reverse Osmosis (RO) systems.
  • $149.99
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