Thanks for the replies. I am trying to determine the appropriate size filter though. I plan to use a Whisperflo WFDS-24 up rated pump. The specs are as follows,

* SF : 1.25
* Full Load Amps : 14.6/4.7
* Wt. : 42
* Model : WFDS-24
* Voltage : 115V
* HP : 1
The flow graph can be seen below, the WFDS-3 is the same pump it's just full rated so the flow should be identical.

http://www-1.pentairwater.com/jwcs/w...rFlo_curve.jpg

I thought I read the average head for an inground pool was 60ft which means the pump will flow 60gpm. The Pentair FNS Plus 36sq.ft. unit flows 72GPM while the 48sq.ft. unit flows 96gpm. Would the 36 be adequate or should I Spring for the 48? I can get a really good deal on a 36 though.

Thanks,
Joe