Replacement element for the Aquasana Salt-Free Water Conditioner for Tankless Water Heaters. Our single cartridge system is designed to hook up to your cold water line prior to a tankless water heater for scale reduction and prevention. Tackles scale buildup that can occur in tankless water heaters, pipes, boilers, fixtures and other heating elements without the use of harsh chemicals or salt. More than just a softener, the Aquasana's Salt-Free Water Conditioner for tankless water heaters uses innovative Scale Control Media (SCM) technology to naturally condition your water without the use of added sodium. SCM technology alters the structure of the hard minerals into a crystal structure that prevents the minerals from binding and forming scale build-up and is proven to reduce scale. Unlike salt-based water softeners, Aquasana SCM technology will not demineralize your water nor will it negatively affect the environment by adding excessive amounts of sodium into our communal water system. The Aquasana Salt-Free Water Conditioner for tankless water heaters is designed to fit easily onto your cold water line prior to a tankless water heater to provide your home with scale protection for up to 2 years. Compare to Pelican Water, Express Water, SpringWell Water Filtration Systems, Ne Aqua Systems, Bluonics, Hardless NG, Culligan, APEC Water Systems, iFilters, & More!