The Tetra Aqua Safe is perfect for making water safe enough for fish and plants. Containing natural extracts for clearer water, AquaSafe will remove chlorine and chloramines as well as neutralising heavy metals. It also adds magnesium, vitamin B, iodine and other elements for health and vitality and will support your fish's protective mucus layers. The World's First Water Conditioner That Transforms ChlorinatedTap Water Into Safe Aquarium Water Suitable For Fish. Add 5ml per 10 litres of tap water.