Hi waste. The pb still has not personally come out to check out the situation, but he has sent someone to start vacuuming out the sand and rocks. He was backwashing(?) and refilling with fresh water at the same time. This was very slow so he changed the setting to recycle to try to filter out all the junk and replace with the same water. I'm not sure this is a good idea, but we'll see. I'll post test results as soon as I learn how to do it! I do know that the pool is almost 18,000 gallons. And and all advice is apprciated. Thanks.

Tisha