Acts against externalfungal and bacteria problems such as the organisms causing fungus mouth and finroteach 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 fishsymptoms mouth and fins appear to be rotting away white cotton wool like growths suitable for treating ponds containing a variety of fish250ml treats 2250 ltr 500 gals for 5 days1 ltr treats 9000 ltr 2000 ga