In-line scale Elminator with brass fittings. For outdoor use only. Do not install indoors, not for potable water. Scale Eliminator cartridge attaches to a 1/4" copper or poly tube water line using 1/4 cc brass fittings. Controls scale buildup and corrosion in coolers. Special formula holds minerals in suspension by raising the solubility level of the water. Reduces mineral buildup on pads and must be used with a bleed off kit or PowerClean purge pump to flush suspended minerals. Lasts up to 3 months and is easy-to-install.