Tetra aquasafe 100ml neutralises harmful chlorine cholramine and heavy metals supports protective mucous layers creates clear waterr tetra aquasafe is suitable for tropical gold fish aquariums at times it is necessary to add tap water to the aquarium as part of a water change or a top up tap water is designed for human use and therefore contains high levels of chlorine to kill germs in addition it may contain varying levels of toxic heavy metals both chlorine and heavy metals are t