I have a 13,000 gallon concrete pool with a spillover spa.
Originally I had a Jacuzzi pump on this system. Can't remember the model number, but it was a 15 year old 1-1/2 hp unit. Replaced unit with a 1-1/2 hp Hayward SuperPump Single Speed. Pressure has never been the same in the spa. No bubbles, etc. Checked all lines and no blockage. venture valves are clean. I know I can install a blower, but since the system worked fine all these years without one, why would I need one now? Any ideas? Different output on different manufacturers?