It's not an exact science.
Work on the basis of 2ml of Starsan per litre of water or thereabouts
So for 5 litres I would use 10 ml, or two 5ml medicine spoons.
Work on the basis of 2ml of Starsan per litre of water or thereabouts
So for 5 litres I would use 10 ml, or two 5ml medicine spoons.