HI All,
I am buying a Pentair FNS plus DE filter and trying to determine flow rates. There are 2 flow rate slisted for the filter. One is under Ress and the other under Comm. Which one do I use to calculate for filter size? I am thinking Comm. My 3/4 Whisperflo will flow 70gpm so I am undecided if I should get the fns 36 which has a comm of 72gpm or the FNS 48 which flows 96gpm.

Any ideas?
Thanks,
Joe