This product is designed as a one off treatment, but may require a second dose after 7 days in heavy infestation. Alternatively you can use Kusuri Fluke M after 7 days
250ml treats 6,252 litres (1.375 gallons) of pond water
500ml treats 12,502 litres (2,750 gallons of pond water
1 litre treats 25,003 litres (5.500 gallons) of pond water
