Actually, during this time when I'm still learning about my pool and SWCG, I have been testing twice a day, to find out whether I'm getting a net gain/loss in chlorine based upon the current SWCG setting, and also to see how much chlorine I lose overnight. I'll probably continue doing this for another few weeks, at which time I'll relax a bit. It takes time to know how much chlorine gets used based upon bather load and weather conditions, but I've learned a lot over the last few weeks. I still think I have more to learn, though.