Mies water purifier has the patent of MAX3.0 reverse osmosis filter element, so it has a long service life. Generally, there are five stages of filtration in the water purifier of Xianke. The first stage is filter element, also called pp cotton, the second stage is granular activated carbon, the third stage is precision compressed activated carbon, the fourth stage is ultrafiltration membrane, and the fifth stage is post-activated carbon. So filter it.