TetraPond AquaSafe Makes tap water safe for fish and other pond inhabitants. It neutralises chlorine and chloramines immediately and effectively binds toxic heavy metals, such as copper and cadmium. Organic colloids protect the fish's delicate mucus membrane. Vitamin B1 helps maintain a healthy immune system and the fish's ability to cope with stress Ideal for making pond water safe after longer periods of rainfall, after each partial water change, and during the initial filling of    the pond