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Purcooflow 20" x 4.5" 5 Micron CTO Carbon Block Filter - 5 Micron Coconut Shell Water Replacement Cartridge
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100% Premium Coconut Shell Carbon: Crafted from high-density, acid-washed coconut shell activated carbon. Offers superior adsorption surface area compared to coal-based carbon, ensuring maximum removal of organic chemicals.
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Exceptional Chlorine & Odor Reduction: Effectively eliminates 99% of Chlorine, Chloramines, bad tastes, and foul odors. Transform your tap water into refreshing, bottled-quality water for drinking, cooking, and bathing.
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Precision 5-Micron Filtration: The uniform carbon block structure acts as a fine sediment filter, capturing particles as small as 5 microns, including fine sand, scale, and cloudiness, without causing significant pressure drops.
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Up To 100,000-Gallon Capacity: Specifically designed for large-scale filtration. One 20" x 4.5" cartridge provides clean water for a family of 4-6 for up to 6-12 months (depending on local water quality).
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Eco-Friendly & Safe Design: BPA-free and lead-free construction. Our low-ash carbon block ensures no black carbon fines are released into your water line, protecting your downstream appliances and fixtures.
- Free Shipping On all orders
- 30-Day Return No worries
- 2 Year Warranty Hassle-free
Tech Specs - CTO Carbon Block
Premium Coconut Shell Carbon
15 GPM
>95% Efficiency
20" x 4.5" (Big Blue)
104°F (40°C)
90 psi
Up To 100,000 Gallons
Food Grade PP / EPDM
90 psi
Universal 20" BB Fitment
Compatible with Most 20" × 4.5" Big Blue Housings
Designed to fit most standard 20" × 4.5" Big Blue filter housings used in whole-house water filtration systems. Easy replacement, dependable performance, and broad compatibility.
FAQs
Learn how Purcooflow's premium coconut shell carbon block technology delivers cleaner, better-tasting water with reliable whole-house filtration.
Contact SupportThe Purcooflow CTO carbon block filter is designed to reduce chlorine, chloramines, unpleasant tastes, odors, VOCs, and fine sediment down to 5 microns. It helps improve the taste, smell, and overall quality of your household water.
No. The large 20" x 4.5" Big Blue design provides a high flow rate of up to 15 GPM while maintaining effective filtration. Under normal operating conditions, most households experience strong water flow throughout the home.
For most households, the CTO filter should be replaced every 6–12 months. Actual service life depends on water quality, chlorine levels, and daily water consumption. The cartridge is rated for up to 100,000 gallons of filtration capacity.
If chlorine odor returns, the filter may be reaching the end of its service life or your local water supply may contain unusually high chlorine levels. Replacing the cartridge will typically restore optimal chlorine reduction performance.
Yes. The cartridge is designed to fit most industry-standard 20" x 4.5" Big Blue filter housings and is compatible with many popular whole-house filtration systems that use standard BB cartridges.
Yes. We recommend flushing the filter for approximately 5–10 minutes after installation. This helps remove trapped air and ensures the filtration media is fully conditioned before regular use.