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Old 19-09-2014, 10:18   #1
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Winterizing -Anti-freeze - Spring Mold

I have used propylene glycol to Winterize my water system for years. Last year I had a significant growth of black, call it "manta" mold. It looked like the stuff had grown in big sheets. I am not sure what caused it last year and not other years? I did open the boat up two weeks later this spring (early June in Southern New England) but there is probably more to it. I read that a lower propylene glycol content could contribute to mold growth. The same reading suggested a content level of at least 35% should limit mold. I am thinking about buying a refractor to make sure I get there. Any other ideas out there?

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