Thank you for your question! The size of the filter is 4.5 inch (diameter) x 10 inch (length). Best, iSpring Water Systems LLC

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iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5"

iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5"

Q: Using ispring dual stage set up. would 2 of these filters work best to remove chlorine from municipal water? the water is clean but chemical laden.

Thanks for your interest in the iSpring whole-house water filter. Knocks out cloudiness as well as bad tastes and odors remove 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. If you have other questions, please call us at 678-261-7611 (M-F, 8:30 - 5:30 EST), text us at 470-560-0012 (M-F, 8:30 - 5:30 EST), or email us at support@123filter.com. We are happy to help.

Q: Do you have to rinse/flush the carbon filter before installing it in the whole house system? If yes, what’s the way to do so? Thank you

Hi TC, You can flush the filter after installation. Just open the nearest tap and let it run until the water is clear or when all the carbon residue is out. Please reach out to our customer service team for additional questions. We're always ready to help. iSpring Water Systems, LLC

Q: is there a catalyitic carbon filter avaiable to remove chloramines?

Chloramine is removed from water with essentially the same strategies that are used to remove chlorine. This means that carbon filtration is the best removal method and filter carbon does indeed remove chloramine. The problem is that it takes more carbon and more contact time to do the job. In practical terms this means that if your City disinfects your tap water with chloramines you'll need to get a larger and better carbon filter than you would need if chlorine alone were used. All our products use activated carbon so are capable of removing chloramine.

Product ID: 256972730

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Details

Brand
iSpring
Material
High-Quality
Capacity
50000 Gallons
Included components
1 FC15B CTO
Item weight
1.23 kg

🌴Premium coconut shell carbon

💧Filters up to 50,000 gallons

🛡️Removes 99% chlorine & contaminants

Frequently Bought Together

iSpring FC15B High Capacity Activated CTO Carbon Block Filter Replacement Cartridge for Under Sink and Whole House Water Filtration System, 5-Micron 10"x4.5"

iSpring FP15B Sediment Filter Replacement Cartridge for Whole House Water Filtration Systems, High Capacity 5-Micron Premium PP, 4.5" x 10", White

iSpring WGB21B 2-Stage Whole House Water Filtration System, with 10" x 4.5" Sediment CTO(Chlorine, Taste, and Odor) Filter, 1" Inlet/Outlet

Description

💧 Elevate your water game—because your home deserves the freshest flow!

ECO FRIENDLY SAFE - Crafted without binders or adhesives, ensuring no carbon ash leaching—just pure, safe water.
SEAMLESS COMPATIBILITY - Fits iSpring’s top under-sink and whole house systems plus standard 10"x4.5" filters for easy upgrades.
PURE REFRESHMENT EVERY DROP - Advanced CTO carbon block eliminates chlorine, odors, and harmful organics for crisp, clean water.
CONFIDENCE IN EVERY CARTRIDGE - Backed by a 30-day money-back guarantee and lifetime tech support from iSpring’s Atlanta-based team.
BUILT TO LAST FILTER AFTER FILTER - High-capacity design filters up to 50,000 gallons—enough for 6 months of uninterrupted freshness.

The iSpring FC15B is a premium 5-micron activated CTO carbon block filter cartridge made from high-quality coconut shell carbon. Designed for under-sink and whole house filtration systems, it removes up to 99% of chlorine, odors, and harmful organic compounds while delivering up to 50,000 gallons of clean water. Compatible with iSpring models US21B, WGB21B series, and other standard 10"x4.5" filters, it offers long-lasting performance with eco-friendly materials and is supported by a 30-day money-back guarantee and lifetime tech support.

Specifications

Brand	iSpring
Model Number	FC15B
Color	5-Micron 10"x4.5"
Product Dimensions	11.43 x 11.43 x 25.4 cm; 1.22 kg
Capacity	50000 Gallons
Material	High-Quality Coconut Shell Carbon
Item Weight	1.22 Kilograms

Have a Question? See What Others Asked

Using ispring dual stage set up. would 2 of these filters work best to remove chlorine from municipal water? the water is clean but chemical laden.

Do you have to rinse/flush the carbon filter before installing it in the whole house system? If yes, what’s the way to do so? Thank you

How Big Is It?

is there a catalyitic carbon filter avaiable to remove chloramines?

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