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4.5x10 Replacement Cartridge

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FP15B Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems
$24.99
iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink and Whole House Water Systems
$43.99
FC15BX4 4.5x10 in. 5 micron Carbon Block (CTO)
$115.99
iSpring FWDS80K Anti-Scale 10
Out of Stock
$149.99
iSpring FM15B Iron and Manganese Reducing Water Filter
$59.99
wgb21b-pb replacement filter
$85.99
us21b filter replacement cartridge
Out of Stock
$57.99
iSpring FP15BX4 Sediment Filter Replacement Cartridge
$49.99
Out of Stock
$79.99
Out of Stock
$219.99
FP15B Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems
iSpring FP15B 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. This filter can also be used for pool and hottub.
  • 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" 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.
  • $24.99
    iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink and Whole House Water Systems
    iSpring FC15B 5-Micron Coconut Shell Activated CTO Carbon Block Water Filter Replacement Cartridge for Under Sink and Whole House Water Systems (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" 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.


    $43.99
    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
    iSpring FWDS80K Anti-Scale 10
    iSpring FWDS80K Anti-Scale 10" x 4.5" Whole House Water Filter with Patented Scale Inhibitor (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.
  • Out of Stock
    $149.99
    iSpring FM15B Iron and Manganese Reducing Water Filter
    iSpring FM15B Iron and Manganese Reducing Water Filter, Replacement Cartridge for WGB21BM, 10"x 4.5" (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
    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
    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.
  • Out of Stock
    $57.99
    iSpring FP15BX4 Sediment Filter Replacement Cartridge
    iSpring FP15BX4 Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems, High Capacity 5-Micron Premium PP, 4.5" x 10", Pack of 4, white (FP15BX4)
  • [Premium Quality Material] Complies strictly with FDA standard (CFR-Part 177) and tested by independent third party against NSF/ANSI standard((NSF/ANSI 42) for material safety and water quality. The polypropylene construction provides superior chemical resistance and is not prone to bacterial attack. This filter can also be used for pool and hottub.
  • [Multi-layer Density Tech] A combination of a sparse layer, compaction layer, and precision layer ensures this iSpring premium 5-micron polypropylene sediment filter captures dirt, sand, silt, dust, rust, and scale particles effectively.
  • [Exceptional Filter Life] Filters up to 15,000 gallons depending on the use and feed water quality. Replace the filter every 3-6 months to achieve optimal 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.
  • [Great Compatibility] Official 1-stage sediment filter for iSpring whole house water filtration system WGB21B. Fits standard 10 inch whole house water filtration systems. Individually sealed for freshness.
  • [Peace-of-Mind Customer Support] Your risk-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.
  • $49.99
    iSpring F2WGB21BKS Whole House 4.5"x10" Water Filtration CTO Carbon Block and GAC+KDF Water Filter Replacement Cartridge Pack Set for WGB21B-KS (F2WGB21BKS)
  • Economical Replacement Filter Pack: This pack includes one 10”x4.5” GAC+KDF water filter (FG15B-KS) and one 10”x4.5” CTO carbon block filter (FC15B) - the official replacements for the iSpring whole house water filtration system WGB21B-KS. Enjoy continuous access to clean and healthy water with this cost-effective filter set.
  • Advanced 1st Stage Filter (FG15B-KS): The 10” x 4.5” compound filter is designed to remove a wide range of contaminants, including chlorine, lead, mercury, hydrogen sulfide, THMs, chloramines, herbicides, odors, and other impurities. Made with high-quality coconut shell carbon and advanced fabrication technology, it ensures superior filtration performance.
  • Highly Effective 2nd Stage Filter (FC15B): The 10” x 4.5” CTO carbon block filter knocks out cloudiness, bad tastes, and odors, while effectively removing up to 99% of chlorine. It is also highly efficient in eliminating herbicides and industrial solvents.
  • Individually Sealed for Freshness: Each filter is individually sealed to maintain maximum freshness and ensure top-notch performance. Replace the filters every 8-12 months, depending on the source water quality, to achieve optimal filtration results. For easy filter change tips, refer to our manual and helpful YouTube videos.
  • Preserve Essential Minerals: Please note that this filter pack is NOT designed to reduce Total Dissolved Solids (TDS). It allows essential minerals to remain in your water, promoting better taste and overall well-being. If you prefer a filter that removes TDS, consider exploring our iSpring Reverse Osmosis (RO) systems like RO500, RCC7, RO100, and more.
  • Out of Stock
    $79.99
    iSpring F2WGB21BDS Whole House 4.5"x10" Water Filtration CTO Carbon Block and Anti-Scale Polyfilter Water Filter Replacement Cartridge Pack Set for WGB21B-DS (F2WGB21BDS)
  • Economical Replacement Filter Pack: This pack includes one 10”x4.5” CTO carbon block filter (FC15B) and one 10”x4.5” anti-scale water filter (FWDS80K) - the official replacements for the iSpring whole house water filtration system WGB21B-DS. Keep your water filtration system at its best with this cost-effective filter set.
  • Advanced 1st Stage CTO Filter (FC15B): The 10” x 4.5” CTO filter FC15B effectively knocks out cloudiness, bad taste, and odors. It removes up to 99% of chlorine and is highly efficient in eliminating organic compounds like herbicides, and industrial solvents. Enjoy fresher and cleaner water from every faucet in your home.
  • Highly Effective 2nd Stage Anti-Scale Filter (FWDS80K): The 10” x 4.5” Polyphosphate filter FWDS80K is specifically designed to protect your household appliances and plumbing from scale buildup. It inhibits corrosion on iron, steel, galvanized, copper, and lead pipes by coating their surfaces. Preserve the longevity of your appliances and plumbing with this essential filter.
  • Preserve Essential Minerals: Please note that this filter pack is NOT designed to reduce Total Dissolved Solids (TDS). It ensures that essential minerals remain in your water, promoting a healthier and more refreshing taste. If you seek a filter that removes TDS, explore our iSpring Reverse Osmosis (RO) systems like RO500, RCC7, RO100, and more.
  • Backed by iSpring Assurance: Your purchase comes with a 30-day money-back guarantee, extended manufacturer warranty, and lifetime tech support from iSpring in Atlanta, GA. We stand behind our products and are committed to providing you with the best customer experience.
  • Out of Stock
    $219.99
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