Minerals ion cartridge provides clean and clear spa water with reduced reliance on heavy chemicals. The active ingredient is zinc. Inert ingredients include vitamin C, calcium sulfate, zeolite, attapulgite-type clay, zinc oxide, and magnesium oxide. Experience improved water quality that you can see, smell, and feel. Easy to install and low maintenance, compatible with most spa care products. The mineral filter stick offers a simple solution for maintaining spa water. Enjoy a relaxing spa experience with greater peace of mind. Features controlled mineral ion release technology that automatically dissolves trace minerals into the water. Designed to work with existing filtration systems and fits most spa and hot tub filters. Effective under continuous 24-hour flow conditions.