Hi all!

The pressure in my filtration unit is reading really high (37-40 PSI). I haven't done anything to different to the pool over the last couple of weeks. Typically the pressure is around 15-20 PSI.


So my questions are:
1) what causes the fluctuation?
2) what can I do to reduce pressure if I catch is creeping up?
3) what troubleshooting steps can I take to figure out the actual problem?

Other factors that might help:
-I recently cut down the pump's hours (from 12 hours to about 5 hours per day)
-The water level fluctuates, but has never been so low that water doesn't flow through the skimmer basket