Low Maintenance-just 1 single unit prefilled mineral stick lasts 6 months. Easy to Install-no assembly needed and no moving parts or electricity required. Filter capacity per mineral cartridge stick up to 5000L,keeps your spa water 180 days fresh crystal clear. Vvebuy 7th controlled mineral ion release technology automatically dissolving trace amounts of mineral ions into the hot tub. Active ingredients are zinc and malic acid. Inert ingredients are attapulgite-type clay,zeolites,zinc oxide,Vitamin E,Vitamin C,potassium chloride and magnesium oxide. Mineral ion cartridge stick is an uncomplicated option for the hot tub user,it will continuously brings you fresh clean spa water. A difference you can see,smell and feel,enjoy your relaxing spa experience with a mind at ease. Will not affected by heat or swimmer load,simply add onto your preferred water care system for the best spa water.