After I haul the boat I close the seacock and run a freshwater hose into the top of the seastrainer then start the engine. I run for a while until the seawater is flushed with freshwater. I stop the engine, open the seaock and drain the seastrainer. I close the seaock and seatrainer, then fill the seastrainer with marine antifreeze (propylene glycol, either pink or purple). I then run the engine and continue to pour propylene glycol into the strainer with the engine running until eithe pink or purple has been coming out of the exhaust for a about 20 - 30 seconds. Then I shut down the engine and open the seaock and close the seastrainer again.
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