Osmosis is a process in which a particular liquid moves to a region that is concentrated with low solvents from a region that is concentrated with more solvents; but for this it has to pass through a membrane that is semi permeable in nature. While gargling too the process of osmosis takes place where the bacteria in the throat get dehydrated. In the case of reverse osmosis a completely opposite process takes place. In different applications like filtration of water for commercial use the reverse osmosis systems are adopted.
Before you purchase a system that works on reverse osmosis it is better if you get to understand the system first. Water needs to be first made drinkable before it is consumed and for this it is very necessary to get the salts of inorganic nature that are dissolved in the water to get separated. Pressure of the osmotic type helps in pushing the water from the tap across a membrane that is of semi permeable in nature resulting in a reverse osmosis process.