We just put our 30" above ground round pool in. It has been up less than 2 months. We did not purchase coving because our pool installer (who has caused us many headaches) recommended building up the sand around the edges. We are now noticing many areas where the sand coving has washed away and left dips anywhere from 2 to 4 inches deep in areas anywhere from 6" to several feet long around the side of the pool. What should we be doing? I assume this is going to be a problem. :hammer