Safe Guard makes tap water safe for fish by removing harmful chlorine and chloramines and detoxifying heavy metals, preventing stress and gill irritation in fish. Safe Guard also removes the excess ammonia created from the reaction with chloramines. Fish can lose their protective slime through handling, fighting, transportation & other forms of stress. Safe Guard coats the fish with a natural barrier of Aloe Vera which can help sooth damaged fish tissue. For use with Tropical & Coldwater fish