Kusuri potassium permanganate is a reliable powedered chemical that tackles a range of pond pond parasite problems.use 6.6g of treatment per 4,546 litres 1,000 gallons. When applying the required dosage it is best to spread this over a 1 hour period. It is advised that the water temperature be above 10°c.note to maintain a healthy oxygen and avoid water discolouration using kusuri hydrogen peroxide 500ml is also advised.