We had a new above ground Outback brand pool installed just yesterday. Starting the pump today, we have a psi of 18 and everything is flowing freely. The manual and the store where we purchased said it should be between 8 to 12 psi. It was leaking everywhere and we got all the leaks stopped. Backwashed as per the manuals instructions and it is still registering 18 psi. The gauge returns to 0 when it is shut off. Is this normal or something we should be worried about? Thanks, Shelly