Emergency! Help introduce a few household RO films with better process materials, thank you!

If the front is clean and there is no water, you first check whether the RO membrane is installed backwards, and then see if the front installation is correct.

The membrane of the household water purifier is generally selected from the Shihan film, which I use at home, which is very good, and I recommend it to you.

Generally speaking, water purifiers have membrane self-cleaning functions.

In the future, when choosing a water purifier, it is best to choose a brand with mature technology. For example, Eco, a ten-year water purifier brand.

American Dow membrane, internationally recognized as a good membrane.

That must be the RO membrane is broken and useless. Generally speaking, the RO membrane can be cleaned, hydrochloric acid and caustic soda are commonly used in the industry to clean, at a certain temperature, through a special offline cleaning device, but also need a pressurized pump, first alkali washing, then pickling, but also soaking, the process is more complicated, but the household RO membrane does not need to be cleaned, make a big fuss, replace a new membrane is only 350 yuan, and the invalid old membrane is discarded.

RO Membrane Cleaning Method:

1. Understand the water quality situation in the area, and the main components, such as the scale composed of calcium and magnesium salts.

2. According to the composition of the scale, configure the liquid (10% hydrochloric acid), or the diluted descaler (the descaler for cleaning scale on the market), or the special RO film cleaning agent for 24 hours.

3. Then rinse the RO membrane after soaking, and rinse the RO membrane with ultrafiltration production water at high pressure, please close the pure water outlet and only open the wastewater outlet when rinsing.

4. The water produced by ultrafiltration is flushed with high-pressure water inlet from the RO membrane inlet and the pure water inlet at the same time, and the water inlet pressure of the RO should be less than the water inlet pressure from the pure water inlet, but the pressure difference should not be too large to prevent the filter membrane from breaking through.

Generally, it is caused by high water hardness, and it is generally possible to use acidic cleaning liquid or scale inhibitor, but to fundamentally improve water quality, it is recommended to change the calcium and magnesium precipitation process while descaling, so as to fundamentally prevent the generation of scale.

RO membrane Chinese means: reverse osmosis, the general flow of water is from low concentration to high concentration, once the water is pressurized, it will flow from high concentration to low concentration, that is, the so-called reverse osmosis principle: because the pore size of RO membrane is five millionths (microns) of a hair, the general naked eye can not be seen, bacteria, viruses are 5000 times it, therefore, only water molecules and some mineral ions beneficial to the human body can pass through, other impurities and heavy metals are discharged from the waste pipe, all seawater desalination process, and astronaut wastewater** treatment are all used in this method, so the RO membrane is also known as the high-tech artificial kidney in vitro.

In fact, it is not said which is the best, first understand your own raw water quality and your own needs, and then choose according to these things. When choosing, pay attention to the desalination rate, water flux, minimum operating pressure, operating temperature, inlet water requirements and so on.

What are the brands of reverse osmosis membranes?

Abroad: Dow, Koch, Toray, Hydeneng.

Domestic: Tianjin Membrane Days.

Reverse osmosis membrane brand introduction:

Dow Dow is a multi-faceted chemistry company that uses science, technology and the power of the "human element" to continuously improve. With annual sales of $53.7 billion in 2010, Dow employs approximately 50,000 people worldwide and operates 188 manufacturing sites in 35 countries with more than 5,000 products. The Dow Chemical Company has been recognized by Business Insider as one of the top 10 companies in the world to "Save the Planet" for its Filmtec reverse osmosis membrane technology and products.

Koch Koch is an American corporation registered in Colorado, USA. Focus on registered trademarks as "Koch" and "Koch". Coriolis has decades of experience in the manufacture and application of membrane membranes, and has truly become a well-known brand with the most complete product chain in the field of membrane separation.

It is one of the largest filter membrane suppliers.

Toray was founded in 1926 and is headquartered in Tokyo, Japan. Toray Group is a world-renowned high-tech multinational enterprise with organic synthesis, polymer chemistry and biochemistry as its core technologies. Toray is one of the first companies in the world to engage in the development of reverse osmosis membrane technology, as early as the 60s of the twentieth century, began the research of membrane technology, from the selection of raw materials, the development of membrane technology, and the design of membrane element structure, etc., to make outstanding contributions to the application and development of this technology in the field of ultrapure water, seawater desalination and other water treatment fields.

Hydranautics was founded in 1963 and is headquartered in Oceanside, California, USA. In 1987, it was merged into Nitto Denko Corporation and is one of the wholly owned subsidiaries of Nitto Denko Corporation in the United States. After 40 years of unremitting efforts, it has become one of the most famous reverse osmosis and nanofiltration membrane manufacturers in the world's separation membrane manufacturing industry, with the most product specifications, the largest production scale and the most patents, and is also the earliest reverse osmosis membrane manufacturer in the United States to pass the ISO9001 international certification.

Tianjin membrane day. Tianjin Membrane Technology Co., Ltd. is a high-tech enterprise with a complete industrial chain of membrane product research and development, production, membrane equipment manufacturing, membrane application engineering design, construction and operation services, and its predecessor was the Membrane Separation Institute of Tianjin Polytechnic University, which was established in 1974. The company has served many fields such as municipal water supply and sewage treatment and reuse, industrial water supply and wastewater treatment and reuse, seawater desalination, drinking water purification, biopharmaceutical purification, concentration and separation treatment.

In terms of product quality, the first-class brand should be Dow, Hydeneng, Dow is slightly better, you can go to the northwest to have a magic check.

This actually depends on whether it is suitable for the standard of your own unit, because some units have a low budget, and the domestic one may be more suitable. However, if stable operation is considered, the bar may need to be raised a bit. In this regard, you can go to the Northwest Magic Net for reference, there are more dimensions, and you may see this problem more objectively.

This reverse osmosis is a technology that has been done abroad for decades, it is relatively mature, and the domestic water is still in its infancy, and the water from the waterworks cannot filter heavy metals and some large particle virus substances, and the RO membrane can achieve a micron pore size to filter out the virus substances. The water quality in China is getting worse and worse, and the water that comes out of the water plant can no longer meet the health needs of the people. Most of the domestic products belong to the primary stage, the product control can not meet the food-grade standards of the United States, Taiwan is a veteran export enterprise, but the country has not done much, you can consider this kind of strength enterprises, or choose imported brands to do.

It is better not to do what the product is poor, so as not to make your relationship die.

Now the prefiltration is basically made of PP polypropylene, which has food-grade hygiene requirements, such as baby bottles, it is recommended to use PP material, which is safer. At present, most of the reverse osmosis membrane cores are polyamide composite membranes, which also have drinking water standards, and the current household water inlets also have to pass the direct drinking water standard. Personally, I think that the material that meets the standard is safe, otherwise the country will ban it, especially after the injection molding agent is so serious food safety, the country pays more attention to food safety, reverse osmosis membrane core is currently very popular, if there is a problem should be detected.

However, at present, many domestic and foreign water inlets have the problem of substandard detection, which can be found on the Internet. There are also those that meet the standards, such as: Sanda Membrane Technology (Xiamen) ****'s "Sanda Water Purifier" has passed the test, and the produced water meets the standard of direct drinking water.

It depends on what brand you're using, and you can't generalize about that. If something is qualified, there is no problem, then if it is a substandard product, the material cannot be guaranteed. Something, there is truth and there is falsehood, you have to treat it differently.

There is such a situation as you mentioned, so there are more than 300 --- 1000 domestic household machines, depending on how you distinguish them.

Which is better, ultrafiltration membrane or RO membrane?

1.The two types of membrane water supply are not used for the same purpose.

Reverse osmosis membrane is mainly used for household drinking water, with the continuous improvement of reverse osmosis technology, reverse osmosis water supply has been able to meet the amount of water used in the whole kitchen. The ultrafiltration membrane water supply can only be suitable for household use and washing purposes.

2.The standards for the two membranes are different.

Reverse osmosis membranes have higher standards. The qualification standard for ultrafiltration membranes is 100 colonies per milliliter of water, while RO reverse osmosis membranes are 20 colonies per milliliter of water. It can be said that the standard of RO reverse osmosis membrane is four times higher than that of ultrafiltration membrane.

3.The pore sizes of the two membranes differ greatly.

The pore size of RO reverse osmosis membrane is only 1 100 of the pore size of ultrafiltration membrane, so reverse osmosis membrane can remove very small organic molecular pollution in water, such as chemical organic matter, organic pesticide pollution, etc. Ultrafiltration membranes, on the other hand, cannot. Reverse osmosis membranes also have the effect of softening water quality, turning hard water into soft water.

Why does it seem that compared with RO reverse osmosis membranes, ultrafiltration membranes have no advantages at all? This is not entirely the case. The ultrafiltration membrane also has its advantages, the ultrafiltration membrane does not need to be connected to electricity, so there is no electrical safety problem, and the joint is small and simple, and the probability of failure and water leakage is low.

Low cost, **cheap. It is an economical filter membrane. Therefore, ultrafiltration water purifiers are also much cheaper than RO reverse osmosis water purifiers.

China's water quality is not good, and ultrafiltration cannot remove some small molecules of toxic organic matter and heavy metal ions. RO can do it all. Many people think that the inorganic salt minerals in the water are very important to people, but they don't know that the content in the water is actually very small, and the important supplement is in fruits and vegetables, so drinking pure water for a long time is not a big problem.

They all have their own advantages, depending on what features you need.

Personally, I think that the ultrafiltration membrane is good, and the ultrafiltration membrane contains minerals after filtration, and you can drink it directly.

Whereas a water purifier filters water until there is nothing (this filtration produces wastewater. About 3:1,) after filtering in the Jiamaifan stone, this is virtually a waste of adding more than that.

The functions of these two types of membranes are different, depending on their specific use, each has its own advantages.

First, the working principle is different.

1. The working principle of ultrafiltration membrane:

Ultrafiltration membrane is a membrane separation technology. It is a technology in which water flows on the membrane surface under a certain pressure, and water, dissolved salts and other electrolytes are tiny particles that can penetrate the ultrafiltration membrane, while particles and colloidal substances with large molecular weight are blocked by the ultrafiltration membrane, so that some particles in the water can be separated. It is suitable for water treatment needs of medium pollution and low hardness water sources.

2. Working principle of reverse osmosis:

Reverse osmosis technology, also known as RO membrane technology, under the action of pressure, water molecules flow through the membrane, but impurities cannot pass through the RO membrane, so as to realize the sharing of pure water and polluting impurities. The RO membrane can filter out heavy metals, organic matter, bacteria, residual chlorine, etc. in the water, and the reverse osmosis membrane does not separate dissolved oxygen, so the water produced is living water, which is especially suitable for the water treatment needs of high pollution and high hardness water sources.

Second, the filtration accuracy is different.

1. The filtration accuracy of the ultrafiltration membrane is microns, which can remove microorganisms, colloids, diatoms and other substances that cause turbidity. It has good hydrophilicity, long life, strong anti-fouling ability, can retain beneficial minerals, and is mainly used in kitchen water purifiers, with a large water output.

2. The filtration accuracy of RO reverse osmosis membrane is micron (1/10,000th of a micron), which is the filter element with the highest filtration accuracy at present, which can filter bacteria, heavy metals, organic matter, residual chlorine, colloidal matter and other harmful substances in water. The purified water quality of the RO membrane is consistent, the service life is long, the sewage is automatically discharged, the water production is large, and the drinking is safe.

Third, the aperture is different.

1. Ultrafiltration membrane is a kind of microporous filtration membrane with consistent pore size standard and additional pore size of microns. By applying the right pressure on one side of the membrane, solute molecules smaller than the pore size can be screened out to separate particles with molecular weights greater than 500 daltons (atomic mass units) and particle sizes greater than 10 nanometers.

2. The pore size of the RO membrane is only 1 100 of the pore size of the ultrafiltration membrane, so the RO membrane can remove very small organic molecular pollution in the water, such as chemical organic matter, organic pesticide pollution, etc. Ultrafiltration membranes, on the other hand, cannot. Reverse osmosis membranes also have the effect of softening water quality, turning hard water into soft water.

Fourth, the scale of use is different.

1. Ultrafiltration membrane is used in: drinking water treatment, domestic sewage and industrial wastewater treatment, other sewage treatment, and in food, it is mainly used in the concentration and clarification of fruit juice, beer production and nutrient extraction; In the pharmaceutical aspect, it is mainly used in the separation and refining of drugs, pyrogen removal, sterilization, etc., especially in the separation and extraction of antibiotics and vitamins.

2. RO membrane is used in: steel, electronics, medicine, electric power, petrochemical, food and beverage, municipal and environmental protection, etc., and plays an important role in the desalination of seawater and brackish water, boiler feedwater, industrial pure water and electronic-grade ultrapure water preparation, drinking pure water production, wastewater treatment and special separation process.

It can be seen that there is still a big difference between RO membrane and ultrafiltration membrane, but with the development of science and technology and the improvement of quality of life, more and more attention has been paid to water treatment.