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Originally Posted by Hatterasguy
Actually raw water cooling is just for people who are to cheap to spring for the freshwater cooling option. With freshwater cooling the raw water is run into a heat exchanger, the heat exchanger is just like a radiator. Most boats seem to use green coolant, although their are a few types of special coolant. CAT for example.
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As I am quite sure you know, there are really two systems. I have a freshwater system (coolant) which is further cooled by a raw water heat exchanger. This Marsolve product is circulated thru the raw water portion of the system to remove calcium and scale.
I still consider the system as part raw water.