Minerals ion cartridge brings you clean and crystal clear spa water without high levels of heavy chemicals. Active ingredient is zinc. (Inert ingredients are vitamin C, calcium sulfate, zeolite, attapulgite-type clay, zinc oxide, and magnesium oxide.) A difference you can see, smell, and feel, spa mineral cartridge improves water quality. Easy to install and low maintenance, compatible with most spa maintenance products. Mineral filter stick is an uncomplicated option for you. Enjoy your relaxing spa experience with a mind at ease. Controlled mineral ion release technology automatically dissolves trace amounts of mineral elements into the water. Mineral stick works with existing filtration system, designed to fit most spa and hot tub filters, available for 24 hours flow.