How could I estimate the amount of time it takes to send all of the water in my pool through the filter one time. I have a 15,000 gallon pool, 1.5HP (1.1kW) sta-rite pump and a Sta-Rite system 3 filter. The filter says max flow rate is 125 GPM, which I guess is gallons per minute. If the filter is my limiting factor, then that is 2 hours to turn over all the water in my pool. I don't know the flow rate of the pump. I am going to assume that the sizing of pipes, holes, etc is as perfect as can be because of the installer's reputation in the area.
Furthermore, I'd like to know the minimum number of times I need to turn over the water in the pool for each 24 hour period, assuming light use and little sun (less than 1 hour exposure a day) with a SWG, FC 3-4.
Finally, if the pool is closed over night, is there any reason to circulate the water at all during the night if the water turned over enough times during the day? Or would running even a bit over night optimize sanitation because the water would not sit for still for 16 hours (or so) straight?
I'm looking for some guidance to start with which I can then tweak for my specific usage. I have a Jandy control, so scheduling is not an issue. I do factor in that I add chemicals in the evening or morning and solar heating is optimal between noon and 5pm.