I opened yesterday and noticed in my initial prime of the pump that the flow was not nearly as strong as it has been in prior years. As I progressed through the three lines, it never seemed to show any increase in strength. I tried backwashing which did not seem to result in any improvement. I left it running as I felt a somewhat strong inflow back into the pool at the jets.
Thinking back to last year, I remember how when I closed the pool, it seemed to take over twice as long to pump down the pool as it had in previous years. Now remembering back even further, I do recall a time last year when I came home from work to notice the pool not circulating. When I checked on the pump, it was going, but no water was moving through it. When I looked into the basket, I could see the water churning, and when I shut the pump off and opened the cover, the water was so hot it was steaming. At that time, I backwashed, and the pump seemed to operate fine. Now I am thinking that all of that was the ultimate cause of this reduced flow.
Can anyone venture a guess as to what occurred last year and is precipitating my issues this year with restricted flow? Could that heat have damaged the impeller? What things should I look for in trying to troubleshoot what is happening now?
Looking forward to another great year of useful exchanges on troublefreepool!