In pool school the recommendation is to run the swg at least 8 hours a day.
The problem is the high electricity rates in my area. The intellichlor power center uses 220 watts. At 8 hours and 0.4/kwh, it would cost $0.7 a day or $21 a month in electricity. Bleach is much cheaper in that case.
I have a 20k pool and by my calculation my chlorine drops by 1ppm a day. At 100% I can run the ic40 for 2.5 hrs or the ic60 at 1.5 hrs to get the chlorine I need. What's the likely problem If I get the ic60 and run it at 50% for 3 hrs a day?