Reverse Osmosis (RO) systems are a popular water filtration systems for drinking and cooking water. Household RO systems are typically located under the kitchen sink and supply you with filtered water out of a separate smaller faucet on your sink. The RO system is made up of several pre and post water filters, usually a sediment/carbon combination, and a RO membrane which allows the system to do the process of reverse osmosis. Even though these systems are very popular, a good amount of people still do not know much about them. Below I will go over some of the most common questions about RO systems we hear.