i was doing quiet well till went home to top up water. opened garage and my pre filters housing had sheared off completely from being frozen .everything had froze up and i was really worried that my ro was froze up . lucky i had 2 spare prefilters housing so changed them and spent the rest of the day thawing the whole system out. eventually got the whole system free from frost but my solonoid had bust so changed that and lucky for me the ro seems to be ok ... i know i should have kept an eye on it but didnt realise my heater had packed up .. hopeully all good now but lost half a day... could have been worse i guess