Blagdon Ammonia Remover instantly removes toxic ammonia and the threat it poses to your fish. Ammonia is the result of the waste produced by fish and if it is not processed can kill your fish. Good cleaning and maintenance routines can help but if you have an ammonia problem then this product will convert the ammonia into a non-toxic compound. It is always recommended to try to have zero Ammonia in a pond. Each 250ml bottle will treat approximately 2,273 litres or 500 Gallons.