Minerals ion cartridge brings you clean and clear spa water with reduced reliance on harsh 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 maintenance systems. The mineral filter stick offers a simple solution for maintaining your spa. Enjoy a relaxing spa experience with enhanced water clarity. Utilizes controlled mineral ion release technology to automatically dissolve trace minerals into the water. Designed to work with existing filtration systems and fits most spa and hot tub filters. Effective with continuous 24-hour water flow.