So I had the pump running while we were swimming today and my son asked me to turn on the waterslide. I did, and then when I went to close the valve to the waterslide, the pump started sounding like it was working really hard and the needle on the gauge was jumping back and forth from 30 to 40. I shut it down and back flushed the filter per my husbands instructions. When that was done I started the pump again and it was at 10 but I noticed the return valve was closed so I opened it really quick and it started doing the same thing. I shut it down and closed the valve and now I'm stuck. It kind of sounds like there is air in there or something? Or maybe a valve is closed that should be open? If I run it will the air eventually get out and the pressure go down?
I'm not touching it until I hear from one of you or my husband calls.