It could be your pre-filters, it could be your membrane, it could be your resin, it could be the cold, it could be a drop in water pressure, it could be a blockage.
Id start at the beginning and try to do my best to work my way through, a process of elimination. Of course is there anything you've done to the system since it was last used will also need to be considered, perhaps a fitting has been replaced in an incorrect fashion.
I think I saw you say on another thread that you have someone who's job is concerned with the water production side of things, has he been playing with the system and not told you?
Then again I'd also invest in a number of things, a pressure gauge, they're cheap as chips.
You've been talking about a pump a lot recently, that and this talk of system problems, what you been doing in that lockup Richy that you've not told us about?
