You are talking of a differant antifreeze, the mercedes one I am talking about has been used for over 20 years and can be used in raw water cooling, the reason I said pink was to point put that more and better aditives are added to make the product last longer in use. it is sold in all good automotive outlets. I think you are talking about the fresh water system antfreeze for tanks and pipes ect. This may confuse people, sorry to come back on this but maybe more information will help people.
Odysseus