After reading some old posts here, I have a new question. Should I use RO filter or not. My water is pretty good comparing to standard. It has little Nitrite, well bellow the safety limit, and little hard. No bacteria has been detected. I have installed softner to solve the hardness issue. My concern is that the water quality may vary due to rain or snow during a year. I cannot monitor the water constantly. So I think it may be make sense to install a RO system for dring water. I saw many information about the greatness of RO, from both manufacturer and third party. I also see some concerns here. Should I install my RO or return it?