King British De-Chlorinator makes tap water safe for fish. Use during initial tank set-ups and whenever conducting partial water changes. De-Chlorinator neutralises harmful chlorine & chloramines and detoxifies heavy metals allowing tap water to be safily added to a fish tank. Also contains Aloe Vera to aid fish health. For use in coldwater, tropical & coldwater aquariums. One 50 ml bottle will treat 450 litres of tap water.