got one of peter fogwills 200 gpd ROs, had it when the mains pressure was 70psi, then water board have reduced the pressure to 35psi (to reduce leaks i suppose) replaced the membrains with 300 gpd (and restrictor)from osmotics. at same time got a booster pump from pure freedom (less than £100).this put the pressure back up tp 80psi. down side is it rattled like a rattly thing so took the gauge off. got 5l of resin from daqua and just put last lot in canister, use 2000-3000ltr a week so i'm quite happy with setup.
dave