Slung it down all night as far as I know, had the ro running overnight as I tend to at this time of year to stop it freezing, but the water was cut off at some point! No idea how long for but could have been disastrous! Problem now is that there's only about 10 psi pressure which has raised ro tds from 1 to 7 not to mention how slow it'll take! Hope that's not permanent!