The water purifier is also called a water purifier and filter. The core of the technology is the filter membrane in the filter unit. Before the water source introduced the super nanofiltration technology, the main technology of the water purifier comes from the ultrafiltration membrane and the RO reverse osmosis membrane. It is a small-scale water treatment equipment that performs deep purification treatment of water according to the requirements for the use of water. The home water purifiers usually mentioned are generally used as small filters for home use. Water purifiers can be divided into many types according to different purification principles and processes. RO reverse osmosis technology has the highest filtration precision (filtering accuracy is 0.0001 micron). Since the pore size of the reverse osmosis membrane is only one hundred thousandths of the diameter of the hair filament, only water molecules and dissolved oxygen are allowed to pass, and all impurities such as pesticides in the water are allowed. Almost all harmful substances such as bacteria, viruses, and heavy metals are excluded. In addition, to reverse osmosis technology, there are many other filtration technologies: nanofiltration (filtration accuracy between 0.001-0.0001 micron), ultrafiltration membrane (filtration accuracy between 0.1-0.01 micron), fine filtration (filtration accuracy below 0.1 microns, Such as ceramic filtration, PP cotton filtration, etc.). PP cotton in the household water purifier can effectively remove rust, sand, colloid and all impurities larger than 5 microns in diameter. The granular activated carbon filter has a strong adsorption capacity, which can effectively absorb residual chlorine, smell, and a difference in the water. Chemicals such as color and pesticides; precision activated carbon filter can effectively remove bacteria, toxins and heavy metals from water. The application of deepwater purification technology in the field of drinking water makes the phenomenon of “unacceptable soil and water” soon become history, effectively solving the local diseases caused by excessive harmful minerals in groundwater in many places.
The function of the water purifier product is to filter the floating matter in the water and remove heavy metals, bacteria, and viruses. It has a high filtration technology, generally five-stage filtration, and the first-stage filter element is also called PP cotton, the second stage. Granular activated carbon, the third grade is precision compressed activated carbon, the fourth grade is reverse osmosis membrane or ultrafiltration membrane, and the fifth grade is post-activated activated carbon, which is mainly used to improve the taste, so the water purifier is more suitable for areas with serious water pollution…
Household water purifiers can be divided into filtration, activated carbon adsorption, membrane technology, electrolysis technology, etc. according to technology, and membrane technology can be divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis.
From the comparison of water purification effect, ultrafiltration <Nanofiltration < reverse osmosis, reverse osmosis water is called pure water, ultrafiltration and nanofiltration require activated carbon to remove chemical pollutants.
Water purifier purchase
If it is a heavy industry polluting city, choose RO water purifier to filter out heavy metal ion insurance. If there is a lot of scale in boiling water (generally the water quality in the north is hard), or the pursuit of drinking water is relatively high, you can choose RO water purifier or water softener. In areas with softer water and less pollution (generally the water quality in the south is softer), if you want to save money, you can use ultrafiltration.
In areas with heavy chlorine and heavy taste in water, you can purchase more water purifiers with more activated carbon. For families with serious pollution and need to drink directly, reverse osmosis can be purchased.
With the deepening of industrialization, there are more and more pollutants in rivers. Tap water is taken from rivers and rivers, and some pollution is inevitable. Nowadays more and more families choose to install water purifiers to solve tap water. Water quality problems. So, what is the working principle of water purifier filtration?
Water filter filtration uses a filter element and is a physical filtration process. It separates water molecules from other impurities through the size of the grid on the filter element. Water purifiers generally have a variety of filter elements, each of which has a different impurity. Filter elements such as PP cotton activated carbon, as well as ultrafiltration membrane, reverse osmosis RO membrane, and other types.
First level: PP cotton PP cotton is mainly made of rust, sediment and other large particles from the water. The large particles are isolated on the outside through the filter holes on the PP cotton. Second stage: granular activated carbon Granular activated carbon has an adsorption function, can adsorb residual chlorine in tap water, remove the odor of tap water, and can also absorb color substances and restore the thoroughness of tap water.
Third stage: compressed activated carbon Compressed activated carbon and granular activated carbon work the same, but the effect is better. 1. Compressed activated carbon particles are fine, using hair hole technology, the diameter is tortuous, which greatly prolongs the contact time between water and activated carbon during use; 2. The decolorization effect of compressed activated carbon is good; 3. Compressed activated carbon has high precision and more abundant filtration, and the water outlet is ensured; 4. Compressed activated carbon filtration accuracy can be controlled; 5. Compressed activated carbon is more environmentally friendly. Compressed activated carbon filtration precision controllable Small class Then there are small partners to ask since compressed activated carbon has more advantages than granular activated carbon, why our water purifiers do not directly contain compressed activated carbon, why should we install granular activated carbon? This involves the rationality of the water treatment process. First of all, if the activated carbon in the water purifier is replaced by compressed activated carbon, the water discharge efficiency may be reduced by at least half on the existing basis. Secondly, water purification is a step-by-step filtration process, so multi-stage filtration is required. Eliminate pollutants in water; finally, the cost of granular activated carbon is lower than that of compressed activated carbon.
Fourth stage: RO film The RO membrane filters all of the above impurities and is mainly used to filter heavy metals in tap water because of its smallest pores. At this point, almost all of the pollutants in the tap water are filtered and can be directly consumed. Granule
Level 5: Rear activated carbon (T33) Using the adsorption principle of activated carbon, it can effectively remove residual chlorine, toxic and harmful substances in water, and improve water quality and taste.
How to choose a water purifier? This time we talked seriously
When did you have the idea of buying a water purifier? Probably when you found unidentified floating objects in the water at home. The author’s hometown is located in Hebei Province. The water quality in the north is hard and the heavy metal calcium and magnesium ions are too high. It is a well-known “common sense”, so it is not surprising that the scale in the kettle is not too long.
However, with the driving of house prices in Beijing in recent years, the Linjing small town where the author is located has also begun to build large-scale construction projects. Various real estate projects have been developed and constructed one after another. I have never felt that water quality has changed. I began to slowly discover that there will always be an unknown after the water is boiled. Some of the mushy floats are very disgusting… I have read a lot of information, although it can’t prove that it has a direct relationship with the “Da Xing Tu Mu”, but this water really can’t continue to be confused and drink… With the water pollution problem in recent years, it is more and more obvious. Aggravated, I think it is time to start a water purifier~
In the purchase of water purifiers, the author has done a lot of homework, basically understand that there are currently types of household water purifiers such as ultrafiltration/nanofiltration/ RO, after the comprehensive comparison is still more inclined to start RO water purifier, because In general, the ultrafiltration membrane is the largest of the three intermediate pores. Its micropores are less than 0.01 micron, which can completely filter harmful substances such as bacteria, rust, and colloid in water, but because of the slightly larger pore size, it does not affect heavy metal ions. To the filtering effect.
Although the pore size of the nanofiltration membrane is smaller than that of ultrafiltration, it filters out most harmful substances including heavy metal ions but retains Ca+, Mg+ trace elements, and small particle size pollutants. In recent years, the hot RO reverse osmosis membrane has a smaller pore size. After the high pressure is applied by electricity, although the wastewater will be more than doubled in the process of purifying water, the water filtered by the RO water purifier is very clean. Because even the minerals are filtered together, it can be regarded as true pure water.
Some people may say here that the RO water purifier filters out the minerals that are beneficial to the human body. What else does it choose? But in fact, everyone ignores the point that the body can drink through the diet. Supplement the necessary trace elements, and in daily life, as long as you pay attention to a reasonable dietary mix, there will be no shortage of minerals. For the specific dietary guidelines, please refer to the “Chinese Resident Balanced Pagoda” published by the Chinese Nutrition Society in 2016. As shown above. Therefore, when purchasing a water purifier, the author is still the most recommended RO water purifier, because the real pure water is the daily drinking water we need.
At present, there are many brands and models of RO water purifiers. In fact, for such products (such as air purifiers), there is no need to pay too much attention to brand factors, because the water purifier itself does not have much cutting-edge technology. The key lies in ” “Stacking” and “work”, because the principle of the water purifier is very simple, that is, the water filter is cleaned by the filter element, and the RO product needs to be energized and pressurized to achieve reverse osmosis, and there is no other so-called core technology. Why do you want to emphasize workmanship, because just like the same piece of iron, the things that the different ironsmiths make are also very different? This is the impact of good work and bad work on the product. When it comes back to the water purifier, there is another need to pay attention to the humanization function, such as filter reminder, water source switching, remote monitoring, etc., and all of this constitutes my water purifier purchase demand.
“People rely on the clothes horse to lean on the saddle, so look at the appearance first.” You will say that this thing is not all under the kitchen. Is it important to look good? Well, I can only say that this is a plus item. Generally, there is no penalty. If you look good, it is a pure extra point. At present, the simple, “sexual cold wind” is more modern and more popular with young consumers. Under the premise of “hidden beauty” in the home environment, The water is usually placed in the kitchen cabinet, so it is a matter of opinion for the appearance of the demand.
▲The role of the water storage bucket in order to increase the flux
The point to be emphasized here is that the current RO water purifier is divided into a barrelless type and a barrel type. What is the difference between the two? In fact, unlike the traditional RO water purifier with a clean water bucket, the benefits of the waterless bucket design are obvious. First of all, it saves space. It can be understood that as long as your kitchen space can accommodate the three-dimensional shape of the fuselage, you can properly avoid the installation problem, and the traditional bucket water purifier must be reserved. Under the premise of body space, there must be enough storage bucket space.
Why is it more recommended to have no bucket?
At this time, you may have to ask? What is the bad effect of the bucketless design? In fact, the main reason for the bucket design is that the water purifier flow of the RO water purifier itself cannot reach the desired water output speed. It is necessary to carry out clean water in advance, and then store it in a water purification bucket for use. Therefore, there is another health hazard in addition to the landfill water purifier, that is, if the water in the bucket is not used for a long time, It becomes the residual water and does not rule out the risk of breeding bacteria. After all, the inside of the water storage tank is not a completely sterile environment.
▲UV sterilization gradually becomes standard
It is worth mentioning here that, from the final purified water reaching the faucet, there is actually a circulation process. How can the bacterial breeding problem in this process be solved? In order to eliminate this last hidden danger, many water purifier manufacturers are In the final part of the affluent, UV-ray sterilization and the like are set up to form the final purification.
▲After the replacement cost of a brand filter
In addition to the above factors, the main job of purchasing the RO water purifier is to select the internal filter element. Here we also make a brief overview. The water purifier filter is mainly divided into the following types:
Primary filter: PP cotton
The PP cotton filter is an indispensable primary filter on the water purifier. It can remove large particle contaminants such as sediment and rust and can protect the rear filter element from large particle contaminants. The replacement period of the PP cotton filter is 3 -6 months.
Secondary filter: pre-granular activated carbon
The granular activated carbon filter can effectively remove macromolecular organic matter, iron oxide and residual chlorine, and can significantly reduce the turbidity of the influent water, and the service life is 6-12 months.
Three-stage filter: RO reverse osmosis membrane
A water purifier can be classified as an RO water purifier, that is to say, this RO membrane, the initial application of RO is to let the astronauts drink their filtered urine in outer space… Of course, the RO reverse osmosis membrane has now For civilian use, it is widely used in water purifiers. The better quality brands are American Pottery/Japan Toray/Korea Shihan… Of course, there are also domestic films, but the best RO film recognized by the industry is American Dow, which is also the hard cost component of an RO water purifier, RO The reverse osmosis membrane effectively removes antibiotics from organic heavy metals, nitrates, and bacteria, and has a filtration accuracy of 0.0001 μm and a service life of 18-36 months.
Four-stage filter: post-granular activated carbon
The main purpose of the rear granular activated carbon filter is to improve the taste because the pure water will be slightly dry after the previous steps of filtration, so in order to finally get enough water into the user’s mouth, this filter is also very necessary. The service life is 6-12 months.