Annie in SC
My pond has run for 7 years with minimal issues. The last two weeks have been a different story. For some reason my pump and my backup pump are losing the prime. It may runfor 20 minutes or 2 days but eventually they stop pulling water. My husband thought it was the bog but we bypassed the bog and continue to have the same issues. We can feel air on the outside of the shutoff valve above the pump. But this valve is in the outflow side not the intake. Does anyone have any ideas as we are at a loss? I don't believe it's the pump because I having the same issue with both pumps. The seals were recently replaced but they ran fine for a time.