BigDave, pressure on filter is the same as on recirculate is runs 17, runs about 10 on backwash. I closed the valve between my skimmer and pump alittle bit, the pressure on the gauge dropped to about 10 psi, but the flow coming back into the pool felt just as strong, and it sounded like it was putting alot of pressure on the plumbing lol. I posted under the pump forum about my sand, I put new quikrete pool filter sand in from home depot, the size of the sand is .85-.425, the sand filter says use .45-.55mm is this about the same? wondering now again if I damaged a lateral when I put new sand in. I cant tell if I`m blowing sand in the pool, I can still only see about 8 inches down.