My SWG has been making some wild % swings lately. I had it on 60% yesterday morning, because my FC level dropped to 4, and when I came home two hours later it was 87%, and FC level was up to 8. I try to keep it at 6 all the time, with a CYA of 70.
I called the Pool Pilot people to ask about these swings, and the first thing he ask was, why do you want your FC so high. I told him I was a new pool owner, and I had researched everything (wife says I'm too anal). He informed that my FC levels should be between 1.5 and 3 to keep it safe, and this would also save the life span of my cell. This has really confused me.
I told him about this site, and he had heard of it, but said I would be better off using NSPF.ORG site because they are the industry standard. I told him I have not had a single issue with my pool testing numbers, and he was surprised that I did my own testing, and never have been to a pool store for a test.
Another thing he mentioned was testing for phosphate's this time of year. I did tell him I had no way to test for these. He informed me that high phosphate level from pollen and all the other stuff in the air this time of year, was a disaster waiting to happen for an algae bloom . Keep in mind he IS NOT trying to sell me anything like a pool store would.
Bottom line is, they are sending a technician from out of state to check what could be causing the large % swings on my unit.