RFC-20 Pentek Whole House Filter Replacement CartridgeThe PENTEK RFC 20 filter cartridge provides effective chlorine taste and odor reduction for 20 inch heavy duty housings. The cartridge combines a 70 micron outer shell and a bed of granular activated carbon (GAC) with a 25 micron spun polypropylene core for better filtration. The unique radial flow design reduces the release of carbon fines significantly when compared to other GAC filters. The RFC 20 filter is ideal for point of entry and other high