I opened my pool and cleaned the filters for the first time on my Jandy CL580 today. I reinstalled them, opened the air release valve on the pressure gauge and started the pump. When water started coming out of the air release valve I closed the valve and checked the pressure gauge. It was reading 0 psi but I was getting water flow out of my returns. I let the pump run for about an hour at 2000 RPM and still had a 0 psi reading. My pool is only a year old so could it be a bad gauge or something else? Last year with new filters the reading was 10 psi.