Kusuri Formalin 30% is best used with Kusuri Malachite Green 2% for the effective treatment of most single cell parasites including White Spot, Costia, Chilodonella, Oodinium and Protozoan Parasites. Use above 12.5°C (54.5°F) Kusuri do not recommend the use of Formalin with any salt solution. 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.