I am getting a buildup of green buildup on the walls of my pool. When you brush it down it just looks like a green dust cloud. The pool is crystal clear and everything checks out good except the cyanuric acid which is around 150. My local pool company suggests it might be pollen and I used and followed their reccomendations without any luck. Any suggestions? Pool is around 13-15 thousand gallon, using a DE filter system. I run it for about 6 hrs a day. While doing the reccomended treatment I ran it for a period of 24+ hrs.
Thanks in advance.