I have a brand new pool freshly plastered and filled with water this past Tuesday. The builder's literature says I can't use my sheer descent for 4 weeks. Why?? The guy who came out and turned on all of the equipment yesterday said when I asked him why, "That's a bunch of nonsense.....it's water...water isn't going to hurt your plaster.....you can run them now" Then why would this very reputable builder put it in their literature??? Thanks, Doug