Universal Alkaline (raise pH level up to 8.5-9.5), ORP and Tourmaline (3-in-1) inline filter, 2"x10" Unique 3-in-1 Filter: Alkaline, ORP and Tourmaline Reduce water Oxidant Reduction Potential to -150mv~-350mv Significantly decrease bodys inner free radicals Accelerate metabolism and boost up immunity of human body Service life: 6-12 months or 400 gallons, 1/4" female threaded connection.