Last May I had my 25,000 gunite pool replastered, followed all maintenance instructions, with no issues. I opened pool last week and while removing the plugs from the return I noticed the walls were rough and not smooth as they were after the job was finished and throughout the season last year. Also, my Dolphin robot has been picking up a lot of what appears to be white looking sand. I have had sand in the pool before due to the filter but it was more of a brown color and below the returns. I was just told they use sand in the replastering jobs. Is this a result of a poor job ? Thanks