i am considering getting a flow meter to be certain what sort of flow rate i am getting. my pool has three 2" suction (main drain and 2 skimmers...all home run plumbed) and i have five 1.5" returns...again all plumbed home run. I have a 500sf pentair cartridge filter. it has a 60 psi pressure gauge on it. I increased the speed of the pump, and i could not get the needle to move off of the stop pin until i hit 1550rpm. at around 1780rpm, i can get the gauge to read 2 psi.
so, plumbing wise, i have very little resistance. any guess what sort of flow i should expect running it at 750rpm? the pentair brochure shows roughly 38gpm at around 5psi.
http://www.pentairpool.com/images/produ ... Curve1.jpg