It's a 6 postion Hayward multi-valve with a sand filter and a Pentair Whisperflo pump. I can manually prime the pump but then it throws filth back into the pool. Pump pressure resumes just fine after the manual prime.
I checked the multi-valve and it appears to be normal. The pump works. Pressure comes right back. Could it be it's just sucking too much air? Why does it throw backwash into the pool after I manually prime? I tried going to waste first, but it didn't stop it from backwashing into the pool. When I put the valve on backwash I get 1/2 pressure on the filter, which I don't think has ever happened before.
Anyone had this happen to them?
I'm sure this isn't enough info to properly problem solve but I'll throw this out for starters.