Pentek Rfc20-Bb Radial Flow Granular Activated Carbon Filter Cartridge, 20" X 4.5" (item #155247-43)

Item #: 155247-43 (RFC20-BB)
Dimensions: 4.50" x 20" (Big Blue)
Media: Granular activated carbon (GAC)
Outer Shell: 70-micron porous polyethylene
Core: Spun polypropylene
Pressure Drop: 0.90 psi @ 4 GPM
Chlorine Capacity: >100,000 gallons @ 4 GPM
Certification: NSF/ANSI Standard 42 (material requirements)
Temp Rating: 40°F–125°F (4.4°C–51.7°C)

Maximize whole house chlorine taste and odor reduction with the Pentek RFC20-BB radial flow carbon cartridge (Item #155247-43). Sized for standard 20" Big Blue filter housings, this cartridge is built with a bed of granular activated carbon (GAC) sandwiched between a spun polypropylene core and a 70-micron porous polyethylene outer shell, delivering the adsorption benefits of GAC filtration at high flow rates ideal for point-of-entry applications.

The radial flow design directs water evenly through the carbon bed, offering low pressure drop while significantly reducing the carbon fines that typically escape from conventional GAC-style cartridges — meaning cleaner-running water without the black carbon dust common to standard granular carbon filters.

Rated for over 100,000 gallons of chlorine taste and odor reduction at 4 GPM with an initial pressure drop of only 0.90 psi, the RFC20-BB is well-suited for larger households and higher water-demand systems. It's tested and certified by NSF International to NSF/ANSI Standard 42 for material requirements, and works well as a high-capacity carbon stage in a multi-stage whole house filtration setup alongside sediment or iron-reduction cartridges.