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. This treatment is ideal for use in a Koi pond where Koi and goldfish are the sole inhabitants. Koi Anti Parasite uses a number of powerful 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.).*Do not use with Orfe, Rudd or Tench. Available in 2 sizes.