The water from my return is coming out noticeably slower this year than previous years. Not sure where I should start to try to diagnose and fix the issue.
A few more clues: When I backflush the filter, the flow there is slower as well (so I presume it probably isn't my return line). I am getting a few occasional air bubbles coming up from the return stream. The pump seems and sounds to be running fine.
Any suggestions where to start?
Thanks in advance!