Reverse Osmosis (RO) plant is designed to removes contaminants like sediment and chlorine from water with a prefilter before it forces water through a semi permeable membrane to remove dissolved solids. Water flows from the more concentrated side (more contaminants) of the RO membrane to the less concentrated side (fewer contaminants) to provide clean drinking water. After water exits the RO membrane, it passes through a post filter to polish the drinking water before it enters a dedicated faucet. The fresh water produced is called the permeate. The Concentrated water left over is called the waste or brine. A semi permeable menmbrane has small pores that block contaminants but allow water molecules to flow through. In osmosis, water becomes more concentrated as it passes through the membrane to obtain equilibrium on both sides. Reverse osmosis, however, blocks contaminants from entering the less concentrated side of the membrane. For example, when pressure is applied to a volume of saltwater during reverse osmosis, the salt is left behind and only clean water flow through