I'm getting ready to do my first all grain batch. I've read differing views on sparging. It seems all that is required is to rinse the grain bed, but one author says you should have 1", 2", or even more water standing on top of the bed. That seems more like a bath than a rinse. I envision sprinkling water on the bed at a rate slow enough it doesn't stand on the grain bed. Or is proper sparging somewhere in the middle?