First of all, I'll tell you the international standard of healthy water.
Seven standards of healthy water:
1) does not contain any toxic, harmful or odorous substances;
2) The hardness of water is moderate: 50-200mg/L (calculated by calcium carbonate) (TDS is 300mg/L);
3) The content and proportion of minerals needed by human body are moderate (macro elements that human body generally lacks: zinc, calcium, magnesium, potassium, strontium, selenium, etc. );
4) The PH value of water is about 7.4, which is weakly alkaline;
5) The content of dissolved oxygen and carbon dioxide in water is moderate (dissolved oxygen in water ≥ 6 mg/L);
6) Small water cluster (Hz numerical representation)
7) Water has strong nutritional and physiological functions (such as penetration, dissolution, diffusion, emulsification and cleaning). );
These are all technical terms. Mainly to let people know about healthy water and advocate people to drink healthy water. Knowing the above conditions, let's choose a water purifier.
First of all, there are three kinds of household water purifiers among more than 500 kinds of water purifiers in China.
The first is multistage filtration. As the name implies, filtering has many layers.
The second is RO reverse osmosis (water purifier). This is equivalent to pure water.
The third type is ultrafiltration (external pressure ultrafiltration and internal pressure ultrafiltration). This category is equivalent to Nongfu Spring.
Well, according to these categories, let me help you classify them.
The first is a technology that existed decades ago. This is the most gullible place for ordinary friends. Why do you say that? Most friends think that a water purifier with seven or eight different filter elements is very clean, but it is not.
Let's analyze its filtering principle: seven or eight filter elements intercept bacteria, rust, virus and colloid, and the filtered water is drinkable.
So no matter what the material is, as long as you calmly analyze it, you will find out where the impurities such as bacteria, rust, virus and colloid are. It's all in your water purifier Everyone has certain knowledge and quality. Naturally, it is clear that the propagation speed of bacteria is quite fast at indoor temperature, from one to two, from two to four. . . After a few days, your water purifier is like a trash can full of bacteria, and before you spend thousands of dollars a year to replace the main filter, you have been drinking, using all the water that has passed through this trash can full of bacteria.
Do you think this technology is advanced? When buying, promoters will often take you into how advanced seven or eight filter elements are, what functions they have, foreign domestic brands and so on. But as consumers, we need to calm down and analyze: we only buy water purifiers to make our life and drinking water cleaner and healthier, and what's the point of choosing such an outdated water purifier full of bacteria? So I think, no matter what brand or filter element, I basically disapprove of multi-stage filtration.
The second type, RO reverse osmosis (pure water machine), is also called space machine. The reason is that it is used in space, and astronauts can't bring enough water to use on spaceships. So the sweat and urine coming out of the body are filtered by RO reverse osmosis before drinking. That is beside the point. Let's get back to the point.
Reverse osmosis is to let the solvent (usually water) in the solution pass through the reverse osmosis membrane (a semi-permeable membrane) with sufficient pressure, and the direction is opposite to the direction of osmosis. The reverse osmosis method which is greater than osmotic pressure can be used for the separation, purification and concentration of solution. Using reverse osmosis technology can effectively remove dissolved salts, colloids, bacteria, viruses, bacterial endotoxin and most organic impurities in water. The main separation object of reverse osmosis membrane is the ion range in solution, which can effectively remove the salt in water without chemical agents, and the desalination rate of the system is generally above 98%. Therefore, reverse osmosis is the most advanced, energy-saving and environment-friendly seawater desalination method, and it has also become the mainstream pre-desalination process.
So how about drinking this machine at home for a long time? The answer is safe and unhealthy. Why do you say that? I believe you can see from the above principle that this RO reverse osmosis is purified water, that is to say, purified water refers to H2O without impurities. Academically speaking, pure water is also called high purity water, which refers to water with high chemical purity. Mainly used in biology, chemistry, metallurgy, aerospace, electric power and other fields, but the purity of water is very high, so the electronics industry is the most widely used. The PH value of pure water is 5.0-7.0, that is, most pure water is acidic water. Preferably neutral water.
Pure water has the advantage of excellent taste, but it is not suitable for long-term drinking. Why? First, human beings have been drinking natural water for millions of years, and this kind of water is man-made and not in the original natural water. Second, in the human body, the proportion of water is 70%, the proportion of water in brain tissue is 80%, and the water in blood is as high as 90%. Even in bones, there is about 15% water. ? Therefore, the human body needs a lot of minerals and trace elements. Pure water only contains water molecules, which can not supplement most trace elements and minerals, and because of its strong permeability and solubility, the original trace elements and minerals can be taken out of the body through the secretion system and excretion system. Lead to the lack of minerals and trace elements.
If you have doubts about the above statement, you can Baidu: drink pure water for a long time. Look at the reaction of various news reports to the effect of drinking pure water for a long time. Therefore, although purified water can remove a lot of impurities such as scale, it has a considerable impact on health.
Then we will go back to the reason for buying a water purifier. We hope to use cleaner and healthier water in our life and drinking. If buying a water purifier and drinking pure water brings you unhealthy, what is the significance of buying it?
Through the comparison of the above two water purifiers, I propose a third water purifier, ultrafiltration water purifier.
Because ultrafiltration is a filtering membrane, the filtering aperture is 0. 1-0.0 1 micron. According to this filtering aperture, bacteria, viruses, microorganisms, red worms, colloids, rust and other impurities can be filtered out. However, it retains the minerals and trace elements needed by the human body.
Why? Because the smallest bacterium is Escherichia coli, and the smallest diameter of Escherichia coli is 0. 1 micron. Meanwhile, minerals and trace elements are molecular and ionic substances less than 0.0 1 micron. So as to achieve the requirements of filtering harmful impurities and retaining beneficial substances. But according to the above two types of water purifiers, you must have questions. Where did the bacteria go after filtration? If it is excluded, will it waste water?
Yes, the general ultrafiltration does mean that impurities such as bacteria are left in the water purifier, but if discharged, it is also quite a waste of water. For example, the water purifier has a wastewater ratio of 3: 1.
Therefore, I recommend Li Sheng water purifier to you here. This Li Sheng ultrafilter has only one advantage, that is, the material is unique and patented. It adopts its patented alloy ultrafiltration membrane, which can automatically discharge pollutants and discharge cleanly, thus guaranteeing the filter element for three years free of charge (written in black and white on the warranty card), and filtering out water containing minerals and trace elements without impurities such as bacteria.
Then, if you use a vertical ultrafiltration machine+ultrafiltration partner, the filtered water still has the effect of weak alkaline water.
So according to the seven standards of healthy water mentioned above, you may ask, is there any small molecular water, solubility and so on? These vertical water purifiers have this effect, but the condition is that they can be drunk directly without heating.
Hehe, why do you say that? Because after water is heated, small molecular water, solubility and other properties are gone. Let me explain to you why. Water is H20, and water molecules are beautiful, but if heated, a large number of water molecules will gather together to form macromolecular clusters. Naturally, there will be no small molecules of water.
Solubility is also achieved by small molecular water. Dissolved substances contact with a large number of molecules, fuse and are taken away by water molecules. If it is macromolecular water, the contact area will be less and the natural solubility will be weak.
Finally, I will give you some brand suggestions. First of all, foreign water quality is different from domestic water quality. Next, you can drink tap water from America. I believe that if I drink my tap water, I will have diarrhea. In terms of brand, according to the global ranking of water purifiers made by Forbes and Morgan Stanley, the quality of ultrafiltration membranes in Li Sheng is the second and the brand value is the fourth. To sum up, I suggest using a vertical water purifier and adopting the mode of vertical ultrafiltration machine+ultrafiltration partner.
If necessary, you can write to me privately and discuss in detail.