I really need to buy an RO unit. Does anyone have a system they have used for a while and would recommend? I guess the budget is $200. Cheaper would be better if it would actually work for a few years. My well water is very hard but no other problem. I don't really need the RO unit to bring it to zeros. Just get the calcium WAY down. I need to maintain a couple 20Gs with the system at a minimum.