So here's what I'd like some input on:
The pressure at my filter used to be around 20-25psi for the couple of years that I have owned my pool (since 2009). When the filter got clogged with algae it would creep up to around 30 if I remember correctly. Recently however the pressure is around 29-30 even when the cartridges have been recently cleaned. I have a Pentair Caretaker in-floor cleaner and the pressure reading at the valve is only 9-10psi. It seems to me this is a too large pressure drop. Also putting my hand in front of the jets in the pool it seems they do not to have the same force that they used to.
The cartridges in the filter were replaced in 2011.