I have been noticing that every time my pumps shuts off it loses prime. Once it starts back up, it takes about 15 seconds to catch prime again. I recently had to replace the pump seal (3-4 weeks ago) because it was leaking. I assumed that the leaking seal was allowing air into the system. I have been in this house for about 6 weeks now and I do know for a fact that when I moved in this problem was not occurring. It seems to have started after I took apart and cleaned my filter, which was about a week after I moved in.
I have been reading about this and I keep reading about suction side and pressure side. I assume that suction side is the piping from the skimmers and main drain back to the pump and the pressure side would be from the pump to the filter and heat pump back to the return jets. Do I have that backwards?
I have figured out that if I close the skimmer and drain valves after I turn the pump off, it will hold prime. As soon as I open any of those 3 valves, air will start bubbling in within about 5-10 seconds. Does that indicate a leak in one of the pipes from the skimmers or drain?