Bermuda Tapwater Conditioner is an easy to use and effective treatment to keep tapwater safe for pond fish. Tapwater contains chemicals like chlorine. While harmless to humans, these chemicals can cause damage to the gills and skin of delicate pond fish. Bermuda Tapwater conditioner removes harmful chlorine and heavy metals and adds a protective coating to protect fish against the water. For use when filling a pond for the first time, topping up from evaporation loss, and when carrying out water changes. 250ml treats 2273 Litres (500 Gallons). Please follow instructions on the back of the bottle for the best results.