Tetra Pond 500ml CrystalWater ClarifierEliminates dirt particles quickly and effectively for crystal clear pond water. Binds cloudiness caused by clay particles or soil, as well as cloudiness caused by organic particles, such as fish waste, uneaten food or dead plant material. Harmless to pond environments: the active ingredients in Tetra Pond CrystalWater coagulate floating particles that cloud the pond water. This makes it easier to filter out these particles or to remove them by hand.