Hi there. My ro system had started to produce water really slow but the quality of the water was still a good low ppm. After inspecting my system I have noticed that the last pre filter which I believe is the charcoal one has failed allowing the charcoal to flow through and then block my first ro membrane. is this a common thing to happen? First time for me in 7 years but my question is does an ro pump help cause this has I fitted the pump at the same time as the last membraines so after replacing the membraines I'm unsure wheather or not to turn it on.