Kusuri Acriflavine 1.5% & Malachite Green Premix 0.7% is a ready to use full strength formulation, popular as a pond-wide anti-parasite treatment. It is particularly good for Costia and Trichodina. 

500ml treats 11,365 litres (2,500 gallons) of pond water
 
Using Kusuri Acriflavine & Malachite Green Premix within a 1 month period of using Fluke M, Fluke P or Fluke S, can cause fish fatalities.