If I don't push my hoselock connection properly on to my R/O I won't get any water flowing through the R/O, it may appear like it's pushed on properly but needs that little bit of a push to ensure it's on properly. I always disconnect my R/O and flush filters whilst transferring stored water to my van, then connect up R/O and wait a minute to hear water running into stored tank, if not I check hoselock connection is pushed on tight enough.