I'm looking at a new filter. All the charts in terms of size correlate to the filter size, how many hours the pump is on, and water turnover. So, say a given filter can process 29k gallons of water in 8 hours and I have a 24k gallon pool. What if I run my pump on low speed? Will I have to leave it running 2x as long? I understand that running filters at a lower gpm setting lets them do a better job, I just don't know how this impacts my pump run time.