The mineral ion filter brings you clean, crystal clear hot spring water without high levels of heavy chemicals. The active ingredient is zinc. (The inert ingredients are vitamin C, calcium sulfate, zeolite, attapulgite-type clay, zinc oxide, and magnesium oxide.) You can see, smell, and feel that spa mineral filters improve water quality. Easy to install, low maintenance and compatible with most spa maintenance products. Mineral Filter Sticks are an easy choice for you to enjoy a relaxing spa experience with peace of mind. Controlled mineral ion release technology automatically dissolves trace mineral elements into water. Mineral wands work with existing filtration systems and are designed to fit most spa and hot tub filters for 24-hour flow