If I am launching and retrieving my boat I only flush the engine by running it in fresh tap water in half a 45gal barrel. If moored in salt water I use the flushing attachment and flush with fresh water for five mins and then use salt away for about a min. At one of the places I moor there are no standpipes on my dock, so i use a 5 gal bucket filled with tap water from the campsite and pump it through with a waterpuppy using salt away until the bucket is empty. About every 100hrs I will take the thermostat out, run the engine for five min, and flush with salt away for a few mins. and then reinstall the thermostat after soaking it in a solution of salt away. When I pulled the leg at the end of the season the enterior looked like new, with just a couple of very small salt deposits.