①. Minerals ion cartridge helps provide clean and clear spa water without high levels of heavy chemicals. ②. Active ingredient is zinc. (Inert ingredients are vitamin C, calcium sulfate, zeolite, attapulgite-type clay, zinc oxide and magnesium oxide.) ③. Spa mineral cartridge improves water quality, with a difference that can be seen, smelled and felt. ④. It is easy to install and requires low maintenance, and is compatible with most spa maintenance products. ⑤. Mineral filter stick is a simple option, allowing you to enjoy a relaxing spa experience with peace of mind. ⑥. It features controlled mineral ion release technology, which automatically dissolves trace amounts of mineral elements into the water. ⑦. Mineral Stick works with existing filtration systems, is designed to fit most spa and hot tub filters, and is available for 24-hour flow.