My pool builder recommended using one of those jet hose nozzles- not the normal spray nozzle- in order to make sure that all the dirt is out of the folds. Also he recommended rincing this way at least once a week - he said waiting on the pressure gauge will only keep you from being able to completely clean out all the junk when you do clean it.

I've only had our pool for a little while - so this is just info I have gotten from him.