The pink stuff has a lot of water in it, and is an electrolyte itself. It does not completely displace the existing water in the cooling system, but mixes with it. So the possibility of galvanic corrosion exists. While it does not seem to cause a problem with salt water boats and zinc anodes, or fresh water boats and magnesium anodes, the question remains what about fresh water boats and zinc anodes? I don't think there is a lot of collective experience there, as it is an unusual situation.
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