This is my first post. I am glad that I found this site a few weeks ago and have it bookmarked it. I wished that I had found this site when we purchased our pool in 2013.
The pool water is crystal clear and has been since it was cleaned after removing the cover about four weeks ago. This is the first year that I can't get the FC to increase. Weekly, I have been shocking the pool with 2 pounds of 73% Cal hypo and adding the algaecide.
Three weeks ago, I began taking the water for testing at the pool store. Each week the results were:
Week 1) FC 0.09 CYA 157
Week 2) FC 0.1 CYA 132
Week 3) FC 0.1 CYA 40
I thought that there was no way that the CYA level reduced that much in one week so I had it tested at a second pool store. FC 0.1 CYA 139
Yesterday, I received the TF-100 kit (no more pool store tests) and put it to use. That test had the CYA at 100 and FC at near 0.
Should I drain the pool water to reduce the CYA? If so, should I attempt to get it at 50? I can only go to the bottom of the skimmer each time since I don't have a bottom drain installed.