1. Scaling: Water dispensers are prone to scale, especially in areas with high water hardness. Most white sediments are carbonates. In fact, these salts exist in the form of very stable compounds, and there is no evidence that they are harmful to human body. However, the existence of these substances affects the heat exchange efficiency, which will bring security risks when scaling is serious. Therefore, the water dispenser should be cleaned in time.
Second, "thousands of boiling water": this formulation is unscientific. The heating temperature of drinking fountains is generally 85℃~95℃, which can't reach the boiling level. But long-term heating will affect the activity of water, so the longer the heating time, the worse the activity of water, commonly known as "aged water." Therefore, when you don't drink water for a long time, you should turn off the power to save electricity and avoid the loss of water activities.
Third, the water dispenser contains nitrite: because the water contains nitrate nitrogen, when the microbial pollution of the water dispenser is serious, it will promote the transformation of nitrate nitrogen into nitrite nitrogen. WHO drinking water directive stipulates that methemoglobinemia will occur when the methemoglobin index exceeds 3 mg/L in a short time. From the current research, there is not enough evidence to show that nitrite is directly related to cancer.
Fourth, bacteria: When the water temperature in the water dispenser exceeds 60℃, it can kill ordinary microorganisms. When the temperature is higher than 80℃, 10~20 minutes can kill Bacillus.
5. The material of the heating liner leads to the precipitation of harmful substances: the material used in most regular enterprises to produce the heating liner is stainless steel, which meets the relevant national hygiene standards. The temperature of stainless steel is much higher than that of boiling water, so it will not precipitate harmful substances. Some fake and shoddy products use unsanitary materials. After soaking in hot water, harmful substances can be dissolved, which will be harmful to health.