Pool was plastered over a week ago with Diamondbrite. I have been doing the regular scrubs and checking the chemistry daily. There is a blob of plaster in the shallow end near the built in stairs and another small line of white plaster that juts out in another section. I don't know if its scale since everywhere I have read scale seems to be a film and this is more pronounced. To me the blob just seems like an imperfection in the plaster. Is there a way I can sand that down. I tried a pumice stone from my wife and the pool sanded the stone, not the other way around, lol.