King British Turtle & Terrapin Water Freshener neutralises organic waste and keeps tanks fresh. Turtle & Terrapin Water Freshener contains four natural types of bacteria which neutralise & digest waste produced by turtles & terrapins. If left untreated, the pollution caused by toilet waste in the water could lead to ammonia poisoning causing the turtles & terrapins stress & even death. Rapidly eliminates the bad odours that can build up when turtles & terrapins are kept in tanks & terrariums. For use in Turtle & Terrapin Tanks Only. When? To Use Turtle & Terrapin Water Freshener - When setting up a new tank or terrarium or as a twice weekly treatment to keep tanks fresh.