the Ecotech L1 is rated to be 3100 gph, but the 1" Apex flow sensor says its only maxing at around 830 gph... something strange there, but I don't know what yet. Not a significant level rise as you can see from the install pic. There are 5 elbows in the path, but doesn't seem that would knock it down 75%, so I have to more noodling over that... maybe 1" pipe is too small, but the output of the pump is designed for 1" pipe.