I want to reduce my hydro bills by running my vs pump at night rather than 24/7 on low. My off-peak rate (7pm-7am) is half the cost of my on-peak rate (11am-5pm). One article recommended starting at 8 hours but some posts recommend 2-4 hours and state that a full turnover is not necessary. What should I start with and at what rpm? Right now it's at 1250 but I find that it's not enough for the skimmer to adequate gather surface debris. It hasn't been a big problem since we don't have trees, but I find myself manually skimming off more bugs and pollen than my old two speed that ran at a higher rpm.