King British White Spot Control is a veterinary medicine for the treatment for fish infected with White Spot. Also known as Ich or Ichthyopthirius, this is a persistent protozoan parasite that exhibits itself as pinhead-sized white spots. Costia & Trichodina can also be controlled with this product. Suitable for both coldwater & tropical aquariums. One 100ml bottle will treat up to 900 litres of tank water.