I run mine 24/7 and my light bill is more in the summer than the winter. My pool guy said it is best to run it all the time. Of course, he told me Baquacil was best for me if I wanted to work on my pool less and enjoy it more... If you have to turn your water over 2x a day, how do you determine how many hours it takes to turn it over? I will save a lot of $$$ this year by using bleach over Baquacil, and I would love to save on my light bill.