Reverse osmosis water purifier purification principle and pure water nutrition interpretation

In recent years, drinking water safety issues have been in the news, water purifiers also followed the fire.
But want to buy a water purifier to fight against “sewage” it, but also worried about the filtered pure water is not conducive to health. A variety of news coupled with blackmail, as an ordinary consumer, the heart is also tired.

To this end, we focus on three issues to help you answer the principle of water purification, teach you how to buy water purifiers according to local conditions and popularize the purified water is really “no nutrition”.

Question 1: Some people believe that often drink water purifier filtered “pure water” will affect health. Water purifier manufacturers also cater to this consumer concept, have launched to retain the “minerals” of water purification products. Drinking mineral water is really better than pure water? Drinking pure water will lead to malnutrition?

Rebuttal: Resident Dietary Nutrition Handbook (2016 edition) suggests that we should consume some macronutrients (such as calcium, phosphorus, potassium, etc.) and trace elements (such as iron, copper, manganese, etc.) every day, which are necessary to form the human body's tissues and maintain physiological functions. However, it is a great pity that these beneficial elements needed by the human body and some toxic heavy metal elements (such as mercury, lead, cadmium, etc.), it is difficult to separate completely with the current separation technology. To stay all stay, to filter all filter.

When choosing a water purifier, you may find that the main mineral water purifier is generally within a thousand dollars, while the main pure water is generally more than a few thousand dollars.

In fact, the main mineral water purifier, its core filtration components are just a relatively low level of filtration, the cost is also lower ultrafiltration membrane / nanofiltration membrane. Manufacturers tend not to tell you this way in addition to leaving calcium, phosphorus, potassium and other minerals, but also the harmful mercury, lead, chromium, cadmium, etc. also stay together.

As for drinking pure water lack of nutrients, Beijing Century Forum Hospital Vice President Zhang Nengwei has publicly said: "The main way for the human body to take in nutrients for the diet. The malnutrition suffered by people who often drink pure water has nothing to do with drinking water."

Furthermore, let's take “calcium” as an example, the daily reference intake of “calcium” in the manual is 800mg, and mineral water on the market generally contains 4mg of calcium per liter, so if an adult drinks 2 liters of water every day, he can only replenish 8mg of calcium by drinking water every day. The calcium content of 1 liter of milk is as high as 1000 mg; a plate of scrambled eggs with fungus contains more than 500 mg of calcium. So for a normal diet, drinking water is only used to metabolize, rely on drinking water to supplement trace elements is not as good as inhaling a few mouthfuls of haze. ▲ per 100 milliliters of milk containing calcium 120mg

To sum up, the director of consumer advice consumers to buy water purifiers category must be “tailored to the situation”.

The first thing you need to do is to get your hands on a TDS pen to check your water quality, and then rely on it to buy a water purifier.

Question 2: A two dozen dollars in the mail TDS pen to test the water quality, rely on it to buy a water purifier in the end reliable?
Popularization: First of all, pure water without any impurities is almost non-conductive. The reason why water can conduct electricity is because the water contains some conductive impurities.

The principle of water quality with a TDS pen is to test the conductivity of the water, and then inverse the total content of all dissolved charged substances in the water, resulting in TDS value (Total dissolved solids, total dissolved solids).

Theoretically, the lower the TDS value, the better, which represents relatively few conductive impurities in the water. But it should be noted that the TDS is not reflective of the content of those non-conductive bacteria and organic matter and other substances, so the TDS value of low is only a one-sided reflection of the water quality is good. TDS value is high to look further. As mentioned in a question above, conductive “impurities” are beneficial and toxic points, some water will contain some elements needed by the human body, and they are conductive, then the TDS value of the water will rise; and some water will be with toxic impurities, then the TDS value of high is not good.

In general, the TDS pen is suitable for families to use as a preliminary analysis of water quality, not very accurate figures, some pollutants (such as bacteria, organic matter, etc.) will not make the TDS value higher. It is recommended that consumers whose tap water has a TDS value of more than 100 can use reverse osmosis water purifiers.
 

Question 3: Why do reverse osmosis water filters require electricity and produce a percentage of wastewater? The principle of reverse osmosis water purifier is?

Answer: First ask you an interesting question, seawater can not drink, seagulls flying in the sea, what do seagulls drink?

The answer is seawater. Because the seagulls have a membrane in the body can filter out impurities in seawater, so human beings modeled on this principle to create a reverse osmosis membrane.

The original design intention was, due to limited space technology, can not carry a lot of drinking water to space, in order to achieve the purpose of drinking water recycling, the use of reverse osmosis water purifier to purify urine and waste water for life. It is worth mentioning that Bill Gates once drank fecal water, in fact, there are also utilized to reverse osmosis membrane filtration!

Because it needs to be pressurized, the reverse osmosis water purifier needs to be connected to electricity to use; the concentrated drainage water discharged is not drinkable and is known as wastewater, which can be used for washing clothes, mopping floors, etc.
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