PWT = Potable Water Treatment. Citrox can be used for treatment of water for human consumption, animal consumption or hydroponic growing systems, etc. For human consumption add Citrox PWT to the water source between 50ml and 100ml per 1,000 litres. For animal water supply add Citrox PWT at 200ml to 300ml per 1,000 litres. Citrox PWT is non-toxic and non-tainting. It is made primarily from citrus pulp, with addition of citric acid and glycerine. It is classified as a food additive under FSANZ regulations, so it can be used on the surface of food products to eliminate bacteria without affecting the quality of the food. Citrox PWT is ideal for use when tramping, camping or hunting, to make any food or water supply safe.