When we built the pool 10 years ago, the pressure at the filter was typically 20 -30 psi. I have a cartridge filter that I replace yearly and clean about once a month. The pressure now is about 35 psi and my filter is about a year old and not too dirty, but probably could be replaced. I took the filter out completely and ran it for about 1/2 hour with no filter at all and the pressure was 28 psi. I would expect this pressure to be about 20 psi like it used to be with a brand new filter.
The return to the pool flows first through our heater. Then it can divide between our spa jets and/or the in floor cleaning system. Before it gets to the in floor cleaning system, it can redirect to a water spout we have in the shallow end.
To make sure I don't have any blockage, I bypassed the heater. Then I directed it all to the spa or all to the in floor cleaning system. When it went to the in floor cleaning, I redirected it all to the water spout or all to the in floor cleaning system. Doing all of this there was no change of pressure at all. This makes me think there is no blockage in the returns as I have sent the return water along a number of different paths with no change in pressure.
The pressure gauge reads 0 at rest. I also replaced that about year ago when I replaced the filter hood and have not had any problems with the new gauge. The old gauge read the same pressure as the new one before I replaced it. I also replaced the pump about 2 years ago with the exact same pump as was built into the pool.
If I was to replace the filter again, I would probably have a pressure of about 28 psi. I'm not sure what could be causing my pressure to be nearly 10 psi higher than when we built the pool with a fresh filter.
Any ideas on what might be causing the pressure increase?
Whoops, just noticed the info on my pool at the bottom is wrong. I will update that:
Cartridge filter - Unicel C-9419 200 sqft
Centurion 2hp pump