I have read that it is rare to have a clogged return but I have a question about mine. I have a new to me pool. It is about 9 years old. The filter pressure was 25 psi when I got it. I just took it all apart and cleaned the grids and installed a new gauge this past weekend and the pressure is 22 psi clean. Still seems a bit high. There is one return in the pool and one in the spa that barely flow at all. When I switch to spa mode the pressure goes even higher. So I was wondering if there is a way to tell if those returns are clogged and that may be causing the high pressure. Thanks for the help as always.