I have a Pentair Intelliflo pump and ever since we moved into the house I've questioned the flow. I have it ramped up to full speed/flow and there are 4 jets in the pool along with the Polaris wall fitting. The jets are split between 3/8" and 1/2" openings. As for the pressure coming out of the jets, it is barely enough to force the air out of the vacuum hose when vacuuming by hand. Could this be an impeller issue?