People's Republic of China (PRC) * * and the Health Supervision Center of the Ministry of Health of the People's Republic of China have clearly issued the Measures for the Supervision and Management of Drinking Water Hygiene, in which Article 21 clearly points out that all products that have not obtained the hygiene license issued by the Ministry of Health belong to' driving without a license' and are not protected by law.
Second, choose materials.
Stainless steel has the best compression and corrosion resistance, and its price is relatively high. Food polar resin or PVC has poor pressure resistance and low price.
Materials with good compression resistance can be used as pre-filter (central machine). The material with poor compression resistance can only be used at the back end of pre-filtration (central machine) as a direct drinking machine.
Two: fixed function.
When choosing a water processor, you must first make clear your purpose. First, from the big concept, you should say whether it is purified water or softened water.
Purifying water is to remove sediment, impurities, bacteria, heavy metals, residual chlorine, organic matter and some minerals from water.
Softening water is to remove calcium and magnesium ions from water, and the most direct thing is scale.
Generally, only cationic resin can be used to complete ion exchange and remove calcium and magnesium ions from softened water. Softened water has the advantages of cleaning skin, washing clothes soft and smooth, protecting water heater and faucet, preventing shower from being blocked by scale and eliminating water stains in sink.
However, it should be noted that it is precisely because it removes calcium and magnesium from water that long-term drinking of softened water will cause calcium and magnesium deficiency in human body.
Therefore, in fact, only when the hardness of water reaches very hard and extremely hard standards should the water softener be used as the drinking water processor. It is a wise choice to use a water softener as a domestic water processor.