To choose a water treatment product, you must first have a comprehensive understanding of filtration technology. In this issue, we invite relevant experts to sort out the relevant concepts so that you can choose to understand. In addition, the purchase of products should also be directed at their own needs, and the experts also gave guidance to the various products on the market.
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Conceptual analysis
What is the difference between clean water and pure water? Does the various filtration technologies on the market make you feel very high? Let experts first generalize the knowledge about water quality processors.
Water quality processor: The so-called water purifier, pure water machine, and water softener are all water quality processors, and the purpose is to "turn tap water into needed water." The executive vice president of the Water Purification Equipment Professional Committee of China Quality Inspection Association and the director of the expert committee, senior engineer Gu Jiuchuan explained that the difference between the three is mainly due to the different water purification processes. The water purifier uses ultrafiltration, microfiltration and activated carbon. It comes out with “clean waterâ€; on the basis of this, the pure water machine adds reverse osmosis, distillation or ion exchange. It is a comprehensive treatment process that provides pure water and drinking water. The pure water machine is mainly exchanged. Lord, soften the water and remove the calcium and magnesium ions from the water, mainly for bathing and washing clothes.
Which machine should I choose? They all have advantages and disadvantages.
Pure water machine: through the reverse osmosis membrane, most of the harmful and beneficial substances in the water, such as organic pollution, heavy metals, minerals, etc., are relatively safer; in the event of unexpected events such as water pollution, it can also cope with Free; remove scale. The disadvantage is that the price is relatively high, the electricity needs to be used, the safety requirements of the product are more strict, the structure is complicated, the joints are more, and the probability of water leakage is also high. The installation and commissioning, the replacement of the filter core, etc. all require the service provider to operate.
Water purifier: It can only remove impurities, sediment, etc. of large particles. Some chemical pollution, heavy metals and organic matter can't be removed, and there is no way to remove scale. It can't cope with unexpected events, but it retains the minerals in the water and the price is cheap. Easy to install, simple structure, low probability of water leakage, no need for electricity, energy saving and safety.
Water softener: Zhao Feihong, director of the Healthy Drinking Water Professional Committee of the Beijing Protection and Health Association, said that soft water removes excessive calcium and magnesium ions in water, but it can not remove pollutants from water. It can only be used as washing water for bathing, washing and washing clothes. It can reduce the amount of detergents and is environmentally friendly.
What kind of water does the average consumer need? According to Gu Jiuchuan, relevant statistics show that the pure water machine equipped with reverse osmosis membrane currently accounts for 50% of the water processor sales. This product is more popular. Zhao Feihong said that the water purifier has a poor removal level of small molecular weight pollutants. The pure water machine can remove 60%-70% of the pollutants in the water, effectively improving the safety of water, but taking trace elements, calcium and magnesium in the water. get rid. "Long-term consumption of this pure water will reduce the body's absorption of nutrients, and more importantly, it will cause cardiovascular and cerebrovascular diseases." What should I do? Zhao Feihong said that this is a dilemma. Her suggestion is consumption. Buy a water purifier and then buy a pure water machine, and blend the two waters before drinking. “This is relatively safer.â€
Technical perspective
In the process of purchasing a water quality processor, consumers will be exposed to many professional names, as well as salesmen's introduction to various filter elements. The reporter learned that most of the pure water machines currently involve PP cotton, activated carbon filter, reverse osmosis membrane, and sterilization equipment. So what are they filtering?
PP cotton filter: filter to remove large particles of impurities in the water, such as sediment, rust, suspended matter, small insects, etc.;
Pre-activated carbon filter: adsorption to remove heavy metals, pesticides, colloids, organic matter (trichloromethane, carbon tetrachloride, haloacetic acid, phenols, endocrine disruptors, antibiotics, etc.), residual chlorine, color, turbidity, stinky And taste;
PP cotton or activated carbon filter: The water purifier then uses this filter to further adsorb and remove the substances not removed by the first two filter elements;
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