ok so the pump is not going to run between 10am and 4pm, saying you keep a chlorine residual of 2-4 ppm that will be gone by 1 in the afternoon, not too mention if people are swimming in the water it isn't going to be filtering at all. I said 8 hours is not going to be more than enough, if anything it is a bare minimum, and those 8 hours need to be continuous and during the heat of the day.