This is my 2nd year with my SJ55. I know they don’t start generating chlorine until water is above 60 degrees. Mine really kicks in and seems to work better once water hits a steady 80 degrees. In the 60-70 degree range, it barely keeps my FC at 4ppm. I’m guessing the water temp is the reason? It was the same way last year, and then it suddenly starts producing more and the only difference is the temperature
CYA = 70
CYA = 70