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Groco water strainer turns white

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Sep 25, 2008
CS 30 Toronto
I have a Groco poly water strainer in the engine intake. This year, it just turned totally white inside. The mechanical strength doesn't seems to be affected. It's in fresh lake water only. The only thing I can think off is annual anti freeze for the winter. But this unit has been few years old on the boat.

Has anyone experience such strange thing.
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