Choosing a reverse osmosis system can involve a lot of factors based on your needs. You will have to decide on a budget for your system. The size of the system will also matter if you have a big family, or you may end up buying too big or too small RO for the need of your family. Make sure to check if the RO system is registered to be safe and good quality. Pick the one which is easy to install or operate so that you can maintain it on your own. RO can waste a lot of water in the process of filtering, so be careful about that too. Check out here to know more about reverse osmosis system.