Does bottled purified water still need to be filtered with a purifying kettle? Please elaborate.

The concept of healthy and environmentally friendly life has become a common pursuit of modern families. Among them, food safety is the focus of people's attention. , water purification systems are also receiving more and more attention from everyone. The best-selling water purifier is a typical example. But, how can you choose a satisfactory water purifier among various brands? Do you know these methods? 1. To understand the types and functions of water purifiers, choose according to your needs 1) Microfiltration (MF): The filtration accuracy of microfiltration is usually 0.1--1 micron. It is used for simple coarse filtration to filter large particles of impurities such as sand and rust in the water, but it cannot remove harmful substances such as bacteria and viruses in the water and cannot be drunk directly. The filter element usually cannot be cleaned and is a disposable filter material that needs to be replaced frequently. The price is also relatively cheap, usually you can buy it for a few hundred yuan. (Common microfiltration machines include: faucet water purifier, Xiaoliantong water purifier, 3+1 water purifier, 3+2 water purifier, ceramic water purifier, etc.). If you are satisfied with the existing water source and only need to remove solid particles such as sediment and rust, you can choose microfiltration. The water produced by the microfiltration machine cannot be drunk directly. It can only be used for the most basic domestic water such as washing clothes and vegetables. It is a kind of coarse filtration. 2) Ultrafiltration (UF): The filtration precision of ultrafiltration is 0.01--0.1 micron. It can filter out rust, sediment, bacteria, viruses, residual chlorine, heavy metals and other harmful substances in the water, and some mineral elements can be retained, but it is not recommended to drink it directly. The filter element can realize automatic flushing and backwashing, and the ultrafiltration membrane is usually replaced every 2-3 years. The price is usually between 1,000-3,000 yuan. If you want to improve the quality of water used for cooking at home without drinking it directly, ultrafiltration is a good choice. 3) Reverse osmosis (RO): The filtration accuracy of reverse osmosis is 0.0001 micron. It can remove almost all beneficial and harmful substances from the water and produce pure water. Generally speaking, they all require electricity. The filter element can be automatically flushed, and the RO membrane is usually replaced every 2-3 years. The price is usually between 1,500-5,000 yuan. If there are pregnant women, children and other groups at home who have higher requirements for water quality, it is recommended to choose reverse osmosis. It should be noted that bottled water and bottled water also use reverse osmosis water production. However, a common problem with bottled water and barreled water is that it takes about 5 days for the finished water to reach the buyer after the water is produced, and bottled water takes even longer. The biggest advantage of installing reverse osmosis water purification equipment at home is that the water produced is fresh and the water quality can be monitored in real time. 2. Whether there is a product hygiene license: According to relevant regulations, manufacturers of water purifiers should obtain a hygiene license from the superior health supervision department, and each brand and model of water purifier has only a unique hygiene license batch number. 3. Whether it is a regular brand and whether it has complete after-sales service: When purchasing products, buyers should try to choose products from regular manufacturers. At the same time, in addition to asking for formal invoices during transactions, they also need to issue an actual warranty from the manufacturer or seller. one.