back when I had strainers with metal covers, Groco maybe? I tapped a hole in the cover so I could attach a ball valve and a female hose end. I'd get back to my slip, attach the hose, and start the water running. Then I'd greadually close the seacock and run the engine on fresh water for a while. No idea how much it may have helped, but it was pretty easy and inexpensive and made me feel better. It was more hose running the hose than anything else.
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