Minerals ion cartridge brings you clean and clear spa water with reduced reliance on traditional 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 is visible, odor-free, and pleasant to the touch. Easy to install and maintain, this cartridge is compatible with most spa water care products. The mineral filter stick offers a simple solution for maintaining your spa, enhancing your relaxation experience. Utilizing controlled mineral ion release technology, it gradually releases trace minerals into the water. Designed to work with existing spa filtration systems, the mineral stick fits most spa and hot tub filters and is effective under continuous 24-hour water flow.