Blagdon\'s Anti Ulcer (formerly known as Interpet) is a treatment for your fish if they are ill due to the following diseases: ulcers, pop eye (swollen eyes), dropsy (swollen body), hollow belly or bacterial gill disease (fish gasping). This fish treatment is supplied in an easy dose bottle and has been developed as a two dose treatment for all types of pond fish, including gold fish. Suitable for treating ponds which contain a variety of fish. Harmless to filters, all species of pond fish, plants and water using wildlife. Easy dose bottle - designed to easily measure 25ml doses. Each 25ml dose will treat 454 litres (100 gallons) of water. Amount required for a two dose treatment: 250ml of Anti Ulcer will treat 2273 litres of water. 1 litre of Anti Ulcer will treat 9092 litres of water. 5 litres of Anti Ulcer will treat 45000 litres of water.