BadOleRoss;4096807; said:Here is a link to a flow chart that I was using that I dont believe is accurate.http://flexpvc.com/WaterFlowBasedOnPipeSize.shtmlHere are some flow rates that I was sent that seem to be closer to what I am seeing in my tank. If you have vertical bulkheads at the water line, cut these number by about a 3rd.size _GPM __GPH 1/2 = 2.50 = 150 3/4 = 5.63 = 337.51.0 = 10.0 = 6001.25=15.6 = 937.51.5 = 22.5 = 13502.0 = 40.0 = 2400
Sorry about the mess, my Lap topis acting up. If you follow the link and scoll down you wil mide a 2nd link on the web page call "Flow Chart", that's what I wastrying to get you to.As far as the other number that look confusing even to me, they basically say that a 1.5" pipe will flow 15.6 GPM or 937.5 GPH. And if you are using bulkheads on the back or side of your tank, cut those numbers to 10GPM and 620GPM. Sorry for the mess!