In the last week my PSI at the filter has dropped from 13psi to 9psi. I can only think of three things that my be the problem:
1. Gauge is bad
2. Pump is going bad
3. Blockage in pipe between skimmer and pump
Are these the only reasons or have I missed some?
Replacing the gauge is easy and cheap.
How can you tell if it is the pump or not?