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What is reverse osmosis? What is the OR film? 2.The principle of reverse osmosis: First of all, we must understand the concept of infiltration.Penetration is a physical phenomenon.When two kinds of water containing different salts, such as separated by a semi-permeable film, it will be found that the water on one side with less salt content will penetrate through the membrane into the water with high salt content, the salt contained does not penetrate, so that the salt concentration on both sides is gradually merged to equal.However, it takes a long time to complete this process, also known as penetration pressure.However, if a pressure is added on the water side with high salt content, the result can also stop the above penetration. The pressure at this time is called penetration pressure.If the pressure increases again, it can penetrate in the opposite direction, while the salt is left.Therefore, the principle of reverse osmosis salt removal is to apply more pressure than natural penetration pressure in sal