I have a long standing problem of not getting a good prime lately -we have checked all of the obvious. I am on my 2nd pool "Pro" and he cannot figure it out as well. The psi pressure starts at about 4 psi when turned on - not a good solid prime and poor return flow out the returns. Filter is clean. He did a leak check and claims to have bown out the lines. What we noticed is that the flow out of the returns will increase somewhat when the polaris is turned off. When polaris is on you cannot feel the water at all out of the returns.
I am thinking that there is still some partial blockage..Any ideas?