sera KOI PROTECT immediately converts every water into fish friendly, clear, healthy and safe pond water. It removes aggressive chlorine reliably, quickly and without affecting the pH, binds toxic heavy metals and prevents water pollution by ichthyotoxic ammonia. sera KOI PROTECT protects mucous membranes and gills. Stress is reduced (e.g. during transport) and the living conditions for fish, plants and micro organisms in the pond are considerably improved.