Air and water are indispensable for human survival, but the growing problem of drinking water pollution has always threatened our lives. In recent years, the problem of water pollution has been exposed by the media, which has made the market of water purification equipment more and more popular. However, the quality of today's water purifiers is mixed, and consumers are often confused by the sales staff, and there is no clue as to how to choose a water purifier. However, when buying a water purifier, there are 4 major remarks that you can't believe. What are you following me? See if you are recruited?
First, the lower the TDS value of water, the safety and health
When consumers purchase water purifiers, sales people often use TDS pens to measure the water quality after purifying water purifiers. Under normal circumstances, the tap water TDS value is several hundred. Once filtered, the effect is immediate, indicating that the tap water has been purified and the water quality is getting better. The salesperson will tell you: the lower the value, the cleaner the water, but the lower the TDS value of the water, the better the water quality is, is it really safe and healthy?
In fact, this is not the case. The TDS pen is only used to detect dissolved solids in water, including inorganic salts and organic matter. The higher the TDS value, the more the impurities contained in the water. The impurities are usually referred to as the concentration of Ca2+, Mg2+, Na+, K+ ions in the water, and cannot directly indicate the quality of the water. Therefore, too high TDS (more than 600, etc.) does indicate that the water quality is not good, but the lower the TDS, the better the water quality is.
TDS values ​​and water quality are two different concepts. The quality of water quality depends on its water quality indicators. The quality of good drinking water should meet the national water quality standards. TDS is only one of many water quality indicators. TDS is mainly used to detect the water quality of purified water, distilled water and RO membrane (reverse osmosis membrane) water purifier. Qualified drinking water must meet microbiological indicators (number of bacteria), toxicological indicators (concentration of heavy metal ions), sensory traits (color, smell, taste, visible to the naked eye) and general chemical indicators as well as radioactive indicators. Healthy and clean drinking water must not contain pathogenic microorganisms. Chemical substances and radioactive substances in water must not endanger human health and have good sensory properties.
In addition, the TDS value is also affected by the temperature of the water. Under normal circumstances, the water temperature rises, the calcium and magnesium ions in the water combine with other substances, and the electrical conductivity increases, so the TDS value also increases. Moreover, the size of TDS can not reflect the concentration of harmful heavy metal ions in water. As for the number of bacteria in water, the high concentration of organic matter, the concentration of nitrite is excessive, and the presence or absence of pesticide residues can not be reflected by the size of TDS. Even if the concentration of bacteria and heavy metal ions in the water exceeds the standard, as long as the concentration of dissolved Ca2+, Mg2+, Na+, and K+ ions in the water decreases, the TDS value will become smaller.
Judging whether the water quality of a water purification equipment is good or bad depends on a number of tests. TDS is only one indicator that affects water quality. There are 106 indicators such as TDS specified by the state. A single indicator does not represent the overall compliance, so the lower the TDS value of water is not super safe and healthy, but if the TDS value is too high, then it is very likely that your water purifier (water purification equipment) filter or membrane should be replaced.
Second, use electrolytic experiments to verify the quality of water quality
Electrolyzed water experiments are often used by many businesses to show and prove the quality of water to consumers. Similar statements are common on the Internet. In fact, as early as 2011, there was a rumor that this “water electrolyzer†could not detect water quality. . The famous "rumor shredder" column in the United States has explained that the seemingly scary reddish-brown sediment is exactly what this so-called "water electrolyzer" produces. This "water electrolyzer" is actually an ordinary electrolyzer, and the principle of use is very similar to that of electrolyzed water.
The two electrodes of the water electrolyzer are composed of iron rods and aluminum rods. Natural water contains some electrolytes such as sodium, iron, calcium, magnesium and other ions that are electrically conductive. After the electrolyzer is inserted into the water, the iron rod of the anode itself releases iron ions by the action of electricity, and the generated iron ions combine with various anions in the water to form various iron compounds, which cause flocculation, which is what we see. It looks dirty.
There are many flocs in tap water and mineral water, and pure water does not contain ions and does not have conductivity, so there is no color generation. However, after adding salt to pure water, it is electrolyzed, and a lot of color flocs appear. Therefore, the electrolyzer makes the color change of water independent of water quality, and water acts only as a conductor. In fact, the minerals contained in tap water are necessary for the human body, so the electrolysis water experiment cannot be used as a basis for detecting the quality of tap water.
Third, the purification effect of the water purifier without discharging waste water is poor
Many water purifiers will tell consumers that the reason for the waste water from the water purifier is that the tap water contains contaminants that need to be discharged with the water. If there is no waste water discharge, the filter effect of the water purifier is poor, and the purified water quality still has residual pollutants, which is not safe and healthy. However, is it really true?
In fact, from a technical point of view, the presence or absence of wastewater represents two different types of water purification technology. The reverse osmosis water purifier does not discharge wastewater, while the ultrafiltration machine does not discharge wastewater. Moreover, the purification effect of the water purifier should be verified by a professional and authoritative third-party testing agency. The testing has professional testing instruments, strict testing standards, and scientific testing methods to verify the purifying effect of the water purifier.
Fourth, the big brand of water purifier, reliable and reliable
The water purifier industry has always been a high-tech industry, and it is difficult for unprofessional manufacturers to really enter the market. There are many well-known brands at home and abroad that sell water purifiers in China. In fact, these well-known brands have no history of producing water purification equipment, and there is no investment in product research and development. They just look for OEMs in some factories in China.
There are also some foreign brands of water purifiers do not understand the serious situation of China's water pollution, using some non-reverse osmosis membrane equipment to pretend to be high-tech products, for heavy metal ions, pesticides, hormones and other pollution in the water can not be completely filtered. A water purifier brand with a certain historical year will surely have excellent products and a large amount of product research and development investment, which is reliable and reliable. In this kind of situation, consumers only need to check the government health department approval documents and business licenses are basically clear.
to sum up:
The sudden outbreak of water purifiers is the rise of people's health awareness. However, the current market is mixed, and many salesmen are running their trains. Untrustworthy remarks about the sale of water purifiers should be kept in mind to prevent being deceived. At the same time, it is best to buy a water purifier to choose a branded regular product, rejecting all three products without exaggerating the facts.
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