Kinshi Zeolite is an adsorbent filter material that binds the harmful breakdown substance ammonium. Ammonium poisoning in fish is prevented with Kinshi Zeolite and algae growth is prevented. Kinshi Zeolite is very suitable to support the natural self-cleaning power of the pond when there is a lot of waste to process. E.g. in the spring, on hot summer days, in the fall and after taking medicines. After a number of weeks or months, the filter material is saturated and must be replaced.