Use this high quality empty inline refillable water filter for almost any water filtration issue. Inline filters can be installed directly into the water line, eliminating the need for a filter housing. We offer many popular filtration media including coconut shell granular activated carbon (GAC), KDF 55, KDF 85, magnesium, softening resins, sea coral calcium, and more. Contact us with any questions you may have! Our expert filter team will be happy to answer and clarify any questions you may have.