When buying net kettle, you must pay attention to the filter element. The key to the filtering effect of the net kettle lies in the filter element, so you should start from this aspect. Check the filter material inside the filter element. Common filter elements include gauze, activated carbon, ion exchange resin, medical stone, active ball, negative ion ball, KDF fiber yarn and PP cotton. The water thus produced is not only clean but also weakly alkaline. Everyone knows that people nowadays are generally acidic, and acidic constitution is the source of all diseases. Drinking weak alkaline water often can adjust the body's pH value. So now many manufacturers in net kettle claim that the filtered water in their kettles is weak alkaline water. However, the author found that the water after passing through was weakly alkaline, and some of them were weakly alkaline, such as Bionde, Green Wave Filter and Jinglan. After the test, the PH value is around 8.2.