how to drink a glass of water

I haven't paid attention to the water quality before, mainly adhering to the principle of boiling and drinking, maybe the water quality before is not so bad. People living in the north are also accustomed to the hard water quality, and they have long been accustomed to a thick layer of scale in the pot of boiling water. It is no exaggeration to say that about ten years ago, there was a cave landscape in the pot.

Later, I used an electric kettle to boil water, and bought a very beautiful little blue kettle. The inner wall was smooth 304, shiny like a mirror. This is where water quality problems emerge. There will be a layer of floating things in the boiled water, it is estimated that it is the debris of scale. Slowly, the inner wall of the pot also began to have a thin scale accumulation. The effect is more pronounced when drinking coffee and tea. So I decided to get some water.

After researching through various channels for a long time (actually, cat and dog), there are roughly several types of water quality improvement methods at home. Simple Fen is plugged and unplugged. The simplicity of unplugging is physical filtration, and the basic principle is filtration and adsorption. Plug-in is more complicated, and the core basically revolves around RO reverse osmosis. Of course someone as refined as me would choose physical filtering. (mainly to save trouble)

Britannia

I read a lot at that time, and finally chose Britannia. In my impression, Britannia almost monopolizes this filter mode (there seems to be Philips, but Philips' various dazzling manufacturers have made my trust in this brand drop a lot). Britannia is basically a pot + filter element, which is easy to operate and does not occupy a lot of space. After all, the value of space now often exceeds the items contained in the space itself (people who store books have a deep understanding).

The filtration of Britannia filter cartridges also has a good adsorption effect on some ions that form scales against various impurities such as chlorine that affect the taste and odor of water. The filtered water is obviously less scaled, and the most surprising thing is the improvement in taste. I remember looking at the clean kettle after the first time I used BRITA, the refreshing feeling was overwhelming. After turning into cold water, the taste is clear and sweet, and it tastes better than pure water. It is not as dry as mineral water. It is not exaggerated. It is very similar to Baisui Mountain, and it is more moist than Nongfu Spring.

The price of Britannia is also relatively easy to accept, the design life of the filter pot seems to be 10 years, and the material of abs is also very safe. The filter elements were originally imported, slightly expensive, and there were many fake ones (I just bought a fake kettle and filter element). The dog family has its own global purchase. If there are activities, the life expectancy can be reduced to less than 1 yuan per day. If the usage is not large, a filter element can be used for two months. The lid is a pure timer.

If it wasn't for the sudden deterioration of the water quality later, I probably wouldn't have considered anything else.

Still on reverse osmosis

At the beginning of this year, the city was suddenly closed due to the epidemic. With the closure of the city, I don't know what's wrong with the water plant, and the water quality suddenly became very bad. Turning on the faucet will make it cloudy (a scene that has been missed for a long time, but it was very common more than ten years ago, and rust-colored water can often be drawn from the tap, especially after the water is stopped. The solution is to keep running the water on. ).

My family's daily drinking water and cooking water have to pass through Brittany once a day. After boiling, there is no taste and the taste is not bad. But this time it really didn't work. Even if Brilliant has passed it twice and boiled it again, the water after that will still feel bitter, and there is an indescribable unpleasantness to drink. Many inconspicuous little things can really drive people crazy after a long time, such as the toilet smells bad, the water leaks, the kitchen smells, and the water is not good. It doesn't seem like much of a problem on its own, but these details are very torturous because they have to be with you every day.

Had to look into water purifiers again. After understanding the basic principles, if you want to completely change the water quality, you have to use plug-in, that is, various water purifiers with RO reverse osmosis as the core technology. Because of the general deterioration of water quality and people living more and more meticulously brought about by environmental changes, it is obvious that there is a huge market in this area, and various products emerge in an endless stream. There are about three kinds, on the cabinet, under the cabinet, and desktop water purification. The first two need to renovate the water pipe and the water tank, and the amount of work is too large. Later, I chose desktop water purification. a certain meter.

Black and white is truly the best color and never goes out of style. A certain Mijia electrical apple is basically white. Out of the box is mainly a water tank, a main body, and two filter elements. Very well assembled.

After rinsing the filter element, I took a cup in normal temperature mode. The water quality is very clear. Does it taste good? like pure water. I have always disliked and purified water, but at least this one really proves that the water quality has been completely improved and no longer has a bitter taste.

A part of the filtered water tank will be left to facilitate the water supply at any time. The heating function is also good. It may not be warm at first, but it can be heated up immediately. Still very convenient.

The water flow cannot be compared with tap water. It takes more than ten seconds to fill a cup, but if you just drink water, this flow rate is enough.

OCD and TDS

The new water purifier was relatively smooth to use, but suddenly one day, no water came out. I thought it was broken, but the display shows that the TDS value of the original water tank is too high, please change the water. I thought before that, like Britannia, the water purifier will absorb the magazines in the water into the filter element. But obviously not, hurry to make up your homework. It turns out that the RO infiltration mode will return to "wastewater", the under-cabinet water purifier will be allocated to the daily faucet, and this single-water tank will return to the original water tank (imagination seems a bit...). Therefore, the top of the water tank will prompt that the last water of each tank of water must be poured out and then replaced. I used to see that the water was almost out of water every time I poured it in. It's so hard to drink a glass of clean water like that.

I saw a small video at station B. After research, a grandma found that the indicator of the filter element is simply a timer, and it cannot show the actual use of the filter element at all. She even sawed the filter element open and came to the conclusion that it would be fine to continue using it after resetting. This conclusion seems to say that all the manufacturers who ask you to change the filter element are liars. The filter element can be reused indefinitely.

But later it was popularized that the filter element is indeed a "consumable" (the word now refers more to people). But think about it, after all, it is used for filtering, and it is impossible to use it indefinitely. Just like the world problem of whether to wear contact lenses for an extra week, whether the filter element can be used for a while after it expires is also a very and very tangled issue for obsessive-compulsive disorder patients.

Later, it was found that there is a thing called TDS test pen, which can quickly detect the TDS value. Although tds cannot be completely equal to water quality, it can be used as a main standard in drinking water.

So I did my homework again and found that people are really getting more and more refined now. The tds test pen is an obviously professional device, but there are so many different brands of civilian-oriented products. In addition, I have to say that a certain rice is really the America of the home appliance industry, and every product has to be plugged in. I ended up buying a single-function detection pen, iSpring. The translation of this brand is not good and it is very mouth-watering, but the water purification equipment seems to be more professional. I have always preferred professional and niche brands. Maojia has a flagship store (of course it is an agent), and there are several kinds of detection pens. In comparison, I gave up the one with the most complex functions and chose a relatively simple one.

I have to say that the 618 is indeed more powerful than usual. If you pay close attention to the daily prices of some products, you can actually win them at a relatively affordable price during activities. I got the pen at the express delivery point today and couldn't wait to test it.

Tap water: around 190

Britannia (the filter should have been used for a while): around 170

Table top water purifier outlet: 27

Water purifier tank: 380+

Boiled Britannia (bottom of the kettle, and the temperature is very high, so the value should be high): 270+

in conclusion:

1. The reverse osmosis of RO is really easy to use, and the water produced basically reaches the standard of bottled water.

2. Municipal tap water cannot be directly drunk. The limit requirement for the TDS value of drinking tap water in my country's 2006 "Drinking Water Sanitation Standard" is: less than or equal to 1000mg/L, which is only a minimum, because water exceeding 1000 is It is determined that it is not suitable for daily use. Municipal tap water does exceed this standard by a lot, but there is still a big gap from the direct drinking water standard. The standard for direct drinking water published by the World Health Organization is ≤ 50mg/L, the standard for direct drinking water in the United States is ≤ 50mg/L, and the standard for direct drinking water in the European Union is ≤ 70mg/L. China has not found any standards for direct drinking water, which may be related to our boiling water and habits.

3. As a physical filter, Brilliant does not achieve the effect of RO reverse osmosis, and its own function is not aimed at tds. With Britannia, it still has to be boiled.

4. The pot of boiling water should be cleaned frequently (just use citric acid), and at the same time, let it stand for a while after boiling water, and try not to drink the water at the bottom of the pot.

5. The water of the RO reverse osmosis water purifier in a simple water tank should still be used according to the instructions for use. It is best to pour out the last part of a box of water and use it to wash clothes or wash dishes and dishes, so don’t drink it. Adding water when it is not cleaned will indeed cause secondary pollution.

6. The purpose of merchants is indeed to make money, but from this perspective, it should not be suspected that all the claims of merchants are to cheat money. Especially compared to more mature industries, it is safest to follow the instructions for use. Nowadays, home appliances have become very complicated, and many things cannot be taken for granted.

7. The progress of human society is to make simple things complicated. In ancient times, people could find a source of water to drink, but there was no concept of water quality at all. Later, you will gradually become conscious of saving some water, and you will also distinguish the water quality by color and taste. Later, you may have the habit of boiling water, and then you will gradually have the habit of drinking tea. In fact, from this point of view, it is also a simple thing that is getting more and more complicated.

8. Groundwater itself is a filtration system. Learning to draw water from the bottom of the well has an incalculable effect on the progress of the entire civilization. If the person who invented the well for drinking water could apply for a patent, wealth would have circled the earth three times. Therefore, in some cases, inventions with great practical value often do not pay off.

9. What becomes complicated at the same time as drinking water is human social civilization itself. When the differentiation of the population becomes more and more obvious, the drinking water itself becomes more and more differentiated. I remember when Shanghai was closed before the city, many people wanted to buy bottled water in a group, and then asked for volunteers to deliver it. In the end, many people were violent. Some critics say that they cause trouble for volunteers, and some criticize that they are still "a lot of things" during special times. However, many innocent people said that they only drink bottled water, and never thought that the tap water could be drunk after boiling. I will not analyze the matter itself and the problems reflected here, but only to say that, purely as a social phenomenon, to a certain extent, it is only available in a special period of civilization and social development, and a simple observation window for the complication of simple problems. If you have time to do "a short history of drinking water", it is actually a good topic.

About TDS

Source: Tianjin CDC website ( http://www.cdctj.com.cn/system/2020/01/13/030006657.shtml )

1. What is TDS?

TDS (Total dissolved solids) refers to the solid residue obtained after water is filtered and dried at a certain temperature, mainly including non-volatile soluble salts, organic matter and insoluble particles that can pass through the filter, also known as filterable solids Or filterable residue, my country stipulates that the total dissolved solid standard of drinking water is ≤1000mg/L.

2. What is the relationship between TDS and water quality?

The more dissolved solids in drinking water, the higher the TDS value and the worse the water quality. The TDS pen is usually used to detect the TDS value in water. When using, insert the pen tip into the water, and the electronic display can read after the value is stable. The lower the value, the higher the purity of the water. Generally, the TDS value of the filtered water of the direct drinking machine is about 20.

3. Is the lower TDS value in drinking water the better?

TDS value and water quality are two different concepts. The higher the TDS value, the more impurities contained in the water, and these impurities usually refer to the concentration of Ca2+, Mg2+, Na+, K+ plasma in the water, and cannot directly indicate the quality of the water quality. Therefore, a high TDS value (over 600) can indicate that the water quality is not good, but a low TDS value does not mean that the water quality is good. The quality of water quality depends on its water quality indicators. Good drinking water quality should meet the corresponding national water quality standards, and must meet microbial indicators, toxicological indicators, sensory properties, general chemical indicators, and radioactive indicators. TDS is only one of many water quality indicators. . The size of the TDS value cannot reflect the concentration of harmful heavy metal ions in the water, the number of bacteria in the water, whether the nitrite concentration exceeds the standard, and whether there are pesticide residues. Even if the concentration of bacteria and heavy metal ions in the water exceeds the standard, as long as the concentration of Ca2+, Mg2+, Na+, K+ and other ions dissolved in the water decreases, the TDS value will become smaller. Therefore, the TDS value is one of the important criteria for considering the quality of water quality, but it is not directly related to water quality.