Hi, I have an 11,576 gallon pool. In the summer I try and turn it over 3x a day during the lowest air electric rate time period. I run the VSP for 16 hours at 2350rpm at a flow rate of 23 gpm and 2 more hours at 3450 rpm at a flow rate of 45 rpm (for the skimmer and pool sweep). I want to switch from a cartridge filter to a Pentair FNS Plus DE filter. What is the optimal size? FNSP 36 or 48? My pool gets a lot of leaves in it throughout the year. Thanks!