When you say "issue", I am not sure what you are referring to? Note that there is 50' of 1.5" flex PVC going to the panels and 50' of 1.5" flex PVC coming from the panels. The 20 psi is typical, even after backwashing. The flow from at the pool return is very strong, and when I backwash, flow is quite strong as well. I just turned the pump on and checked the pressure gauge prior to starting. It was at 0 PSI.