This is a five day course of treatment that builds an effective dose in the pond whilst minimizing stress on the fish. The five-day course also ensures that effective levels of active ingredients are present over a period to catch parasites in the susceptible phase of their life cycle. Interpet Anti Parasite uses a number of active ingredients to create an effective and safe treatment that acts against: White Spot. Slime disease protozoan parasites (Costia sp., Trichodina sp., Chilodonella sp.)Flukes (Dactylogyrus sp. and Gyrodactylus sp.)Velvet parasites (Oodinium sp.)Available in 3 sizes.