The prominent point in the purification function of reverse osmosis water purifier is that the precision is about 0.0001 μ m. It is like a sieve and can basically filter 98% of bacteria and viruses in water. Therefore, in the concept of many people, the water from the water purifier will not produce white sediment, but the water quality is also divided into hard water and soft water, even if the hard water is filtered by the water purifier, it is still hard water. It can't change the essence of water quality, but after hard water boiling, the compounds in hard water will decrease with the increase of temperature and solubility, resulting in the condensation and precipitation of minerals or suspension in water after boiling. In addition, this phenomenon sometimes occurs in cold water, which is related to the alkalinity of water. However, the white sediment formed by the rise or fall of water temperature does not affect the quality of water, so there is no need to worry.