I currently run my filter (and SWCG) for 6 hours per day. I have it come on at 8:00 p.m. and shut off at 2:00 a.m. I do this because the sun is down and the chlorine level builds up without having to fight the UV burn off, and it is reportedly cheaper to run your pool at night, but I am not convinced. I have approx. 11,500 Gallon pool. I know I could have it start at midnight, but I kinda want to be awake when the pump starts to make sure there aren't any problems.

If it is safe to assume that that the chlorine level will be highest at 2:00 a.m. when the pump shuts off, and lowest after sunset before the pump kicks on, then I would suggest you see what your chlorine level is after sunset. Yesterday, when I got home from work at 5:00 p.m., the Chlorine level was approx. 3 ppm. So I am thinking I could effectively cut back on the ON time.

Also, watch your pH level.