Pentek / Culligan RFC20-BB Radial Flow Carbon Filter - 25 Micron4-1/2 Diameter for Big Blue or Grande 20 HousingsThe RFC-BB heavy duty filter is designed to reduce chlorine taste and odor. It is ideally suited for high flow, point of entry applications. This filter is 4-12 in diameter and fits in large, big blue housings. Change filter approx. every 2 months.
