I have a 400 gal/hr sump pump that has approx 4' of tubing to top of tank (return). Is that called head pressure? not sure. My overflow came with the tank (1" dia U-tube). I have a prizm skimmer that does the job. I am not concerned about the skimmer, IMO, it does the job. I just want more water movement to the sump and back to the tank. would i just be wasting time and money?