Colombo Alparex is a great pond treatment for parasites such as Trichodina, Chilodinella and Whitespot. Alparex is also good at battling fungal infections. Colombo Alparex Anti Parasite treats invisible Parasites - which cause grey skin disease such as Ichtyobodo, Chilodinella and Trichodina. These presence of these parasites can on be determined with a microscope. Symptoms of an infection include listlessness, chafing and reduced appetite. White Spot - caused by Ichtyophthirius or Ichtyo Fungus - most caused by Saprolegnia. Can be recognised by the appearance of greyish white, cotton-like growths on the skin and/or gills. Colombo Alparex 250 ml will treat a 5000 Ltr pond. (1100 Gallons) Colombo Alparex 500 ml will treat a 10000 Ltr pond. (2200 Gallons) Colombo Alparex 1000 ml will treat a 20000 Ltr pond. (4400 Gallons) Colombo Alparex Dosage: Day 1 - 25ml per 1000 litres of pond water Day 2 - 25ml per 1000 litres of pond water Colombo Alparex Composition Acfriflavine HCL 20mg/ml Malachite Green 2mg/ml PLEASE NOTE: Please read the instructions carefully you MUST have a Kh of 5 or more before using Colombo Alparex.