Reverse osmosis water treatment equipment is usually composed of three parts: raw water pretreatment system, reverse osmosis purification system and ultra-purification post-treatment system. The purpose of pretreatment is to make the raw water meet the water intake requirements of the reverse osmosis membrane separation component and ensure the stable operation of the reverse osmosis purification system. The reverse osmosis membrane system is the most economical and efficient purification method to remove more than 98% ions, organic matter and 100% microorganisms in raw water at one time (theoretically).