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, this mineral cartridge is compatible with most spa maintenance products. The mineral filter stick offers a simple solution for maintaining your spa, helping you enjoy a relaxing experience with peace of mind. Featuring controlled mineral ion release technology, it automatically dissolves trace amounts of minerals into the water. The mineral stick works alongside your existing filtration system and is designed to fit most spa and hot tub filters, providing continuous treatment with 24-hour flow.