Can the psi on my pool pump be too low?

The psi on your pool pump indicates how much dirt there is in the filter, the cleaner the filter the lower the psi. normally when the filter is clean you wil have a low psi and as the filter gets dirtier it will rise. However if the psi suddenly becomes much lower then usual it may indicate a fault in the filtration is letting unfiltered water circulate back into the pool as in a torn filter cartridge.