Yes the recommended dose is 10ml per litre when the bottle is fresh and new but how do you measure how much it's decomposed over 3 years? If it's sat in a hot garage over summer how can you determine how much you should increase the concentration? This is the difficult part and it would be important to solve this problem for customers that do not use the whole container in a short period of time. Commercially most breweries would probably go through a container of this stuff in a few months. But for domestic customers we have to find a solution to this problem.
