The In-line Granular Activated Coconut Shell Carbon Filter is a high-quality replacement filter designed specifically for use with 5 and 6 stage RO post filters. This filter is made with premium-grade materials and utilizes granular activated coconut shell carbon to effectively remove impurities and improve the taste and odor of water. Its compact and space-saving design makes it easy to install in-line with your existing water filtration system. Upgrade your RO filtration system with the In-line Granular Activated Coconut Shell Carbon Filter for superior water quality and peace of mind.