Yesterday I switched to flexible PVC
everyone I talked to had me convinced it was better... We did the first test run and the main tank almost overflowed. The pump does 1300gph, it's a one inch pipe, durso standpipe, and my return is just hard PVC
pipe that goes up and over and then some Flexable tubing to actually run it under the water. I didn't use a ball valve (the guy at the store I bought the pump from said I wouldn't need one), and another guy I talked to said his 50 gallon tanks pump pushes 1800gph and he has 1" tubing and no ball valve.
How can I make it drain faster? Could it be that I filled my sump tank with to much water? I had it filled just above the pump but the pump started to suck air after a couple of minutes, so I put a couple more gallons in and that's when it started to overflow.
At least it's quiet as a mouse when it was running (: