1. Select the function according to the regional water quality characteristics: Because the water purification technology and filter element combination structure are different, different water purifier products are used according to different water quality. Gemeihui's water purification products include: water purifier, ultrafiltration machine, reverse osmosis water purifier, direct drinking machine, commercial water purifier and so on. Can meet the different needs of consumers. 2. Understand the function of filter element: Different filter elements have different functions and importance. For example, the granular activated carbon filter can filter out larger granular impurities in water, while the RO reverse osmosis filter can filter out harmful substances such as heavy metals, so you should also understand the function of the filter before buying a water purifier.