I don't understand it.
When the pool was first installed last spring, the filter pressure would run a little of 10 psi in highspeed, 6 psi on low speed, and about 20 on the spa on high speed.
For the last month or so, It's been getting higher & higher. I cleaned the filters a few weeks ago, thinking that would help it come down. No joy, not even a little bit. It was reading 30 psi before & after the cleaning.
Last week, I decided to clean them again. Still no luck.
So today I vacuum the pool, when I put everything back to normal the pressure is over 40 & the little valve on top is spewing water.
I took everything apart, cleaned the filters, removed the PVC going between my filters & the heater, removed the little flapper valve (check valve) made sure it worked properly, didn't find any obstructions.
But the pressure is still high 40 psi, I don't understand.