Further to a thread by Paul Mather on water production, both he & I have been struggling with poor pressure from our RO's, probably due to poor mains pressure. I've overcome this by restricting the flow of the waste water. This has increased the pressure in the system, uped my production of pure water significantly & reduced the waste. Seems blindingly simple & effective, but will it severly reduce the life of the membranes & the flilters?