I'd love answer to this too. My pool is much smaller than yours (5700 Gallons) and I have a Haywood 3/4 HP Power Flo matrix Pump on a DE Filter. Dealer told me about 3 hours and thats what I've been doing and pool looks great. Electrician is Going to put it on a timer cause I often forget to turn it off after 3 hours!! Electricity is WAY TOO high here for me to run it more than 5,6 hours per day!