Kusuri 30% Formalin and Malachite Premix is a ready to use full strength formulation, popular as a pond-wide anti-parasite treatment. It is particularly good for White Spot, Skin Flukes, Chilodonella, Oodinium and most Protozoan Parasites. Do not use below 12.5°C (54.5°F). Please ensure that you read, understand and follow all Health and Safety guidelines on the bottle. Please do not eat, drink or smoke whilst handling chemicals. Wear disposable vinyl or latex gloves and appropriate eye protection. 250ml treats 11,365 litres (2,500 gallons) of pond water 500ml treats 22,730 litres (5,000 gallons) of pond water 1 litre treats 45,460 litres (10,000 gallons) of pond water