Acts against externalfungal and bacteria problems, such as the organisms causing fungus, mouth and finrot.Each bottle contains a a five day course of treatment to slowly build dosage levels in the pond, this maximizes the effect of the treatment whilst minimizing stress on the fish.Symptoms: Mouth and fins appear to be rotting away; white cotton wool like growths. Suitable for treating ponds containing a variety of fish.250ml: Treats 2250 ltr : 500 gals for 5 days1 ltr: Treats 9000 ltr : 2000 gals for 5 days 25ml treats 1,136 litres (250gallons) per dose.