I have three returns (2 regular returns and one for the pool cleaner). The two regular returns have different flow coming out. The one closest to the pool equipment comes out pretty fast and shoots up through the surface of the water a bit. The second return is about what I'd consider normal. For the life of me, I can't remember if the flow is the same or more than last year (just put in the pool last year). Does that sound normal?
For clarification, it does it regardless of just backwashing, or rising pump pressure prior to backwashing? Same flow in either scenario. My pump pressure is usually at 17 PSI (with my new gauge from TFtestkits.com). After about a week, it usually rises to about 20 to 22 psi.