You can refer to the following important indicators when purchasing: There are many categories and a wide range of coverage. Please read patiently. After all, a water purifier is related to the health of your family
First look at the filter element: it is the core component of any water purifier. The quality of the filter element directly affects the purification index of the water purifier. This is undeniable.
First of all - let’s focus on whether the filter element can filter impurities and make the water look clearer (it can be said that any water purifier can do this, but different filtration methods have completely different effects) ) are generally divided into two categories, no matter how nice the name of the business is.
Filter membranes: The market is also full of filter membranes with various names, such as pp cotton, etc.; in fact, they have only one function, which is to filter impurities above a certain specification.
Reverse osmosis: the most common on the market, with a filtration rate of 99% becoming its biggest selling point;
The disadvantage is also obvious that it is too clean (it does not have any minerals that are beneficial to the human body and is not recommended) For adults to drink for a long time, it is forbidden for infants, babies, and the elderly; and it cannot filter bacteria, viruses and other microorganisms) The filtration speed is slow
By the way, a popular science: Reverse osmosis application scope - preparation of space water, purified water, distilled water, etc. ; Alcoholic beverage manufacturing and water reduction; preliminary preparation of water for medicine, electronics and other industries; concentration, separation, purification and water distribution preparation for chemical processes; desalination and softening of boiler feed water; desalination of seawater and brackish water; papermaking, electroplating, printing and dyeing , food and other industries water and wastewater treatment; urban sewage advanced treatment.
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Granular activated carbon filter element: It can remove odors in a short time, but over time it will be flushed out of the waterway and lose the filtration effect; the disadvantage is that the service life is uncertain (the user has to wait until the filter element loses its purification ability) We will know later)
High-density activated carbon: long use time; block structure, will not form water channels; disadvantages are complicated production and expensive (100 times higher than equal weight granular activated carbon) due to Protected by patents (resulting in high production costs)
In recent years, a diatom mud filter element has also appeared: Popular science: Diatom mud (English: Diatom mud) The main raw material is diatom minerals formed over hundreds of millions of years ——Diatomaceous earth. Diatomaceous earth is a natural substance deposited by algae living in oceans and lakes. Its main component is opal. It is rich in a variety of beneficial minerals and has a light and soft texture. An electron microscope shows that its particle surface has There are countless tiny holes, the porosity is over 90, and the specific surface area is as high as 65㎡/g. Diatom mud products have a unique "molecular sieve" structure, which has a strong ability to purify the air and eliminate odors. Therefore, it can be regarded as a dual function of filtering impurities and filtering odors, but it cannot filter bacteria (absolutely) as the merchants say. Most bacteria and fungi are less than 0.2 microns in size and cannot be filtered directly, and the algae themselves can also carry bacteria)
Another ceramic filter element: the manufacturer claims that it can perform filtration, antibacterial and activation treatments. At present, the ceramic filter element with the highest filtration accuracy in the world is a dual-control membrane ceramic filter element with an average pore size of 0.1μm (micron)
But——
The smallest bacteria known so far is Nanobacteria have a cell diameter of only 50nm = 0.05 microns, which is even smaller than the largest virus.
Most viruses have a diameter of 100nm (20~200nm), and larger viruses have a diameter of 300-450nm. Nano (nm), smaller viruses are only 18-22 nanometers in diameter.
It can be imagined whether the antibacterial effect can be achieved.
Finally - pay attention to whether the water purifier can kill microorganisms. Viruses and bacteria in microorganisms are potential pathogens that must be removed (general products cannot kill microorganisms; some products can Microorganisms, but technology determines the risk of purification)
Physical antibacterial: It is to physically block the passage of bacteria and viruses. Once everyone understands the diameter of viruses and bacteria, it is not difficult to choose.
Chemical antibacterial: Use chemical filters to kill microorganisms; Disadvantages: Chemical residues, affecting taste and health (treatment method: Install after the chemical filter, improve taste ion filter or activated carbon filter; make consumers unable to taste Abnormalities are directly detected on the screen, making it more difficult to identify chemical residues)
Ultraviolet sterilization; sterilization rate is as high as 99; Disadvantages: Requires electricity (potential safety hazards of leakage; of course, potential risks can be avoided through wireless power conduction technology ) However, this technology is protected by patents (production costs are high)
A qualified water purifier can: filter impurities, retain minerals beneficial to the human body, and improve the taste of drinking water (meeting Chinese standards) Sold on the market in China
A high-quality water purifier must: filter impurities, retain minerals beneficial to the human body, filter various chemical pollutants, improve the taste of drinking water, and kill bacteria and viruses (in line with International standards, can pass testing and be sold in any country and region around the world)
In my country, the traditional production process of tap water has a history of more than 100 years. At present, most water plants are still stuck in the "flocculation-sedimentation-filtration" On the basis of "monochlorine disinfection". China's national drinking water standard refers to the "National Standard of the People's Republic of China GB 5749-2006". This standard has been in use for 10 years, while foreign developed countries generally revise their standards every 3-5 years.
You may think it’s a bit long, but I’m helpless before I can explain the various products on the market! But everyone should be happy, congratulations on reading the longest part of this article.
Second look at the installation: Whether the water purifier is convenient to install will directly affect your future use (is it easy to move? Can you install it yourself? The simpler the installation, the more convenient it is to maintain)
Avoid first - altering the pipes. The so-called under-counter machine will find it very inconvenient when the filter element needs to be replaced.
(For example: Reverse osmosis needs to install a booster valve and the pipeline must be modified, so it requires professionals to come and install it, which is very troublesome and also poses potential safety hazards for people to enter and exit)
(For example: Low-end machines also need to modify the pipes to install additional clean water outlet pipes, which also require on-site installation by professionals)
Of course, this is not absolute. Nowadays, merchants are trying to avoid modifying pipes as much as possible. When purchasing, you need to Ask in detail.
Of course it is best - there is no need to modify the pipes. Wall-mounted or countertop water purification equipment generally falls into this category, and it is very easy to install and replace.
(For example: Ezhiyuan water purifier uses a diverter valve. You only need to connect the diverter valve to the faucet to separate the use of purified water and tap water. The installation is also very convenient, and the user can Easy to assemble, debug and use)
Third look at consumption: The first is waste water - water purifiers with reverse osmosis technology produce waste water during the water purification process.
Heavy metal elements in wastewater often exceed the standard by several times and dozens of times. Therefore, washing clothes with discharged wastewater will harden the clothes; using it for mopping will damage the floor and floor tiles; even flushing the toilet will not Yes, it will corrode ceramics; it is even more impossible to use for washing vegetables; therefore, the generation of waste water greatly increases the cost of use.
The ratio of wastewater is also a key indicator that directly affects the consumption of water purifiers. The ratio of wastewater generated by low-end water purifiers is as high as 1:6 (purifying 1 ton of drinking water requires 6 tons of water) ; 1 ton of tap water is 3 yuan, so you will need to spend 21 yuan to drink 1 ton of direct drinking water)
Some companies with mature technology can compress wastewater consumption to 1:3 (that is, drinking 1 ton of direct drinking water requires It costs 12 yuan)
Over time, this is an unknown expense (the more polluted the water source, the higher the proportion of wastewater)
For water purifiers that do not use extreme technology such as reverse osmosis, No wastewater is produced during the water purification process, which can appropriately save purification costs.
Secondly, the filter element - any water purification equipment will filter impurities and other harmful substances during the purification process to contaminate the filter element, so the filter element needs to be replaced regularly.
Common water purifiers with several levels of filtration technology on the market: generally replace the impurity filter element, pp cotton and activated carbon filter element every 3 months; replace the reverse osmosis filter element every 6 months; the price ranges from 150 to 800 yuan. If you replace the filter element on time every year, excluding the labor cost of the door-to-door attendant, it will cost about 100 yuan * 3 filter elements * 4 times 800 yuan * 2 times = 2800 yuan; in fact, the cost of the filter element is much more than this cost, but many people do not replace it on time. Because I don’t know when to replace it)
High-end water purifiers all use filter cartridges (the filter elements are combined in sets) and the cost is about 1,500 to replace them only once a year.
The fourth factor is convenience: whether it is convenient to use the water purifier is also an important indicator that determines the quality of a water purifier.
Is it convenient to replace the filter element?
Some low-quality or low-end water purifiers boast that their water purifiers do not require replacement of filter elements in order to make people feel more convenient and save trouble. So how do they explain: "Where did the filtered impurities go?"
So they actually made up the saying: They were magnetized?
Magnetization: refers to the process of making a non-magnetic substance acquire magnetism.
Rather than what some salespeople said: consciousness melted away by magnetism!
The so-called magnetized water is to allow ordinary water to pass through a magnetic field of a certain intensity in a direction perpendicular to the magnetic lines at a certain flow rate, so that ordinary water will become magnetized water.
They boast that they can purify this place. How can it be improved?
But the magnetized water only needs to leave the magnetizing equipment for 30 seconds to completely lose its magnetism. The effect can be imagined
The most reasonable way to say it is backwashing: I heard some not long ago The salesperson said that the water purifier of a certain brand does not need to replace the filter element. As for cleaning it every 7 days, it can be used for 20 years (cleaning it every 7 days, 4 times a month, 48 times a year! It needs to be cleaned in 20 years) 960 times)
It’s a miracle that I can persist (so, how much time is spent on each cleaning, how much is it worth) (if you forget to clean, will you still drink clean and safe water)? I really do I admire them for being so capable! ! Of course this is a joke, what they call cleaning is actually rinsing the equipment with water to clean the filtered impurities. It seems like 3 minutes or 5 minutes each time? I can't remember clearly. This is an unknown expense and involves huge risks.
Why?
Have you ever waited at a red light? 99 seconds is 1 minute and 30 seconds. People will be impatient and unable to stay. Maybe you will do something else. If you forget to turn off the water by then, what will happen? It can range from waste to flooding.
Do you think so?
As far as replacing the filter element is concerned, the replacement of the filter element of the water purification equipment on the market is often very complicated (if it is a set of 5-level purification equipment, the filter element should be replaced every 3 months or 6 months, each time 5 filter elements; 3 filter elements 14 service fees and 14 break-in risks)
Draining wastewater to give the illusion that the filter element is clean is also a common sales method for businesses. Why do you say it's an illusion? First of all, this method can only be used for filter elements. For activated carbon filter elements, it will increase consumption (activated carbon filter element: granular type has a maximum service life of 6 months, and block type only has a few tons of water in a year, so it must be replaced) In fact, such continuous backwashing of the filter will also reduce the life of the filter.
Therefore, some high-end water purifier manufacturers use filter cartridges, which allow you to easily replace the entire set of filter elements yourself, which is convenient, trouble-free, and saves worry and time.
Personally, I suggest that you buy products that replace filter elements. However, door-to-door service is now provided on time. It is difficult to find high-quality merchants, and many merchants do not provide door-to-door service for free. You can choose to replace the water purifier with the filter cartridge, so that when you replace it, you can buy it yourself and just take out the filter cartridge and replace it with a new one. Personally, I think this is the safest, and you can change it yourself without having to find someone else to visit
Finally, there is the reminder function - when to replace the filter element is also one of the advantages of high-end products.
Low-end products will not indicate the service life of the filter element. It is entirely up to the user to estimate it or replace it according to the instructions (in this way, even if the filter element fails, fails to meet the purification requirements or even becomes like waste water, the user You don’t know how to drink it as usual; how terrible it is! You have accidentally drank the heavy metals and pollutants accumulated for several months)
High-end products provide template indicators to remind users whether the filter element needs to be replaced.
Another point is convenience - different technologies will also bring different usage experiences when using them (for example: some products need to be powered on to use, encounter a power outage and shut down, and must be restarted when a call comes, maybe after a long time What should I do if the customer can’t find the manual and forgets the button to restart? This will not happen with high-end products, and it can be used normally without restarting. Isn’t it more convenient?
Fifth. Look at reputation: Through the above understanding, you should have a very clear understanding of the purchase of water purifiers. Therefore, any water purifier that says there is no need to replace the filter element is deceiving you. If you don’t believe it, ask him to read the manual. The replacement time of the filter element will definitely be marked on it. For a company that is not trustworthy, the product quality will not be good! !
The sixth thing to look at is technology: The technology here refers to a world-class patent (it is not a technology that can be used by everyone on the market and is used by everyone)
The protection period of patented technology : From the date of application, invention patents are valid for 20 years, utility model patents and design patents are valid for 10 years. During this period, others have no right to use it. After the protection period, you can apply for authorization from the patent applicant or unit and pay to use it (it will be the most commonly used technology after about 30 years, and it will be free at this time). Therefore, it is used by everyone on the market. It is not an exaggeration to say that technology can be regarded as obsolete technology! !
Seventh, look at sales: A good salesperson will introduce to you in detail the water purifier he sells, and compare it with other similar products, as well as the performance advantages and disadvantages of various devices, rather than blindly Promote your products.
By the way, this is also a method used by many water purifier salespeople to mislead consumers (drinking alkaline water is more beneficial to health!!)
In fact, drinking alkaline water Same as acidic water.
Because normal human body fluids are weakly alkaline, the pH value is around 7.4. In daily life, human body fluids have a strong neutralizing and buffering function, and humans themselves can maintain a pH balance. Therefore, no matter whether the food you consume is acidic or alkaline, the pH value of the human body remains basically unchanged. There is no such thing as "acidic constitution" caused by eating acidic foods. Therefore, when water is drunk into the stomach, the stomach environment itself is acidic, with a pH of 2-3, and gastric juice is a highly acidic buffer solution. No matter what kind of water you drink, the pH will change to acidic when it reaches your stomach.
Therefore, many sales staff’s statement that “only drinking alkaline water is good, drinking weakly acidic water is harmful” has no scientific basis and is still misleading propaganda for the time being.
Eighth, read the instruction manual or user manual: Why must you read these two things?
Because it has so many benefits, it can reflect a lot of information very intuitively.
For example: does the filter element of the water purifier need to be replaced?
The effect of the water purifier - some high-end water purifiers will indicate in the user manual what harmful substances and experiments they can purify parameters and results. You will be more aware of it, and the words printed on the instructions and user manuals have legal effects. If the effects are not achieved, they will become the basis for attacks by peers.
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If you have read this far, don’t hesitate to discuss this sentence:
Why do the same water purifier manufacturers produce water purifiers of the same brand, different models, and different prices?
I used to think it was normal!
But after collecting and organizing this information, I suddenly realized it! !
If a low-priced model (so-called Level 3) water purifier produced by a certain factory can meet the water purification requirements?
If you can!
So is it necessary for it to produce high-priced models (so-called level 5 or level 8) water purifiers?
And it’s much more expensive!
Then again - what if the high-priced water purifiers it produces can truly meet water purification standards?
Wouldn’t selling low-priced water purifiers be a scam and deceive customers? !
This question has been bothering me...
Therefore: I personally feel that the price is not important when purchasing a water purifier, nor is the brand. The only important thing is the effect!
Imagine this: Even if you only spend 200 yuan to buy a water purifier, the water purifier you bought for 200 yuan does not achieve the expected results! That's equivalent to a waste of 200 yuan. Do you think so?