How to choose a good RO water purifier?
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How to choose a good RO water purifier?

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How to choose a good RO water purifier?

RO English full name: Reverse Osmosis is reverse osmosis RO pure water machine (or RO reverse osmosis pure water machine/RO water purifier) is a water purifier that uses the principle of reverse osmosis technology to filter water.

RO reverse osmosis technology is a high-tech product developed by the U.S. government and NASA in order to solve the problem of drinking water and carrying water for astronauts in spacecraft. It has been widely used in military, medical, industrial , civil and other fields. Known as one of the six high-tech in this century.

RO water purifier: Under a certain pressure, water molecules (H2O) can pass through the RO membrane, while inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities in the source water cannot pass through the RO membrane, so that part of the water It is separated through the RO membrane, and the water that is not permeated becomes concentrated water due to the increase of solutes. The main separation object of the reverse osmosis membrane is the ions in the solution, which does not require chemicals and can effectively remove the salt in the water. The salt removal rate of the system is generally above 98%. Reverse osmosis is the most advanced, energy-saving and environmentally friendly desalination method, and it has also become the mainstream pre-desalination process. Generally, the hardness TDS of pure water produced by household water purifiers can be less than 12; industrial use can be less than 1; the core of RO water purifiers is RO membrane, and the best RO membrane is currently recognized as the Dow membrane made in the United States.

RO water purifier is usually 5-stage filtration:

Level 1. 5um PP cotton (for scale inhibition, rust impurities, etc.)

Level 2. Granular activated carbon (for adsorption of chemicals)

Level 3. 1um PP cotton or compressed activated carbon

Stage 4. RO Membrane (Key Filter)

Level 5. Rear coconut shell activated carbon filter (for improving taste)

The first three stages of filtration are pretreatment, providing qualified source water for RO filtration. Because RO filtration is slow to produce water, it is usually equipped with a pressure storage tank and a pressure switch to control the work and stop of the machine.

Working principle of household water purifier

Fully computerized automatic water production and replenishment, which is actually a miniaturization of water plants, which can be transplanted to homes or offices. Using the safest water treatment technology at present, it will be a healthier, more convenient and more economical drinking water solution in the next 20 years. After five-stage filtration, it has reached the standard of direct raw drinking in Europe and the United States, thoroughly filtering out bacteria (0.4-1 micron), viruses (0.4-0.02 micron), toxins, heavy metal ions, organic compounds and other harmful substances, and at the same time increasing the oxygen content of water. It is weakly alkaline, more suitable for human absorption, sweet and delicious.

The working principle of the laboratory water purifier:

The laboratory water purifier adopts a combination of advanced reverse osmosis technology and ion exchange technology. The booster pump, solenoid valve, high-capacity ion exchange resin, R.O reverse osmosis membrane, filter element, pipeline connection, control element, Ultraviolet lamps and other products are imported from abroad.

Using microcomputer single-board computer program control, water quality detection is automatically displayed, so as to obtain high-quality output water, and its output water resistivity can generally reach 18MΩ/cm.

Household reverse osmosis pure water machine

The working principle of household reverse osmosis pure water machine:

Level 1: Five-micron PP filter element, which can effectively remove impurities such as sediment, rust, and suspendeddomestic ro water purifier for sale - qinhuangwater solids. It is usually replaced every 2-4 months.

Level 2: Granular activated carbon filter element, which can remove color and odor, and can remove chemical substances in water, such as chlorides, pesticides and carcinogens. It is usually replaced in about half a year.

Level 3: The one-micron PP filter element can further remove large particles of impurities that cannot be effectively removed by the previous two levels, and is generally replaced about half a year. Further protection of the fourth stage RO reverse osmosis membrane.

Level 4: High-tech precision RO reverse osmosis membrane, the pore size is only one ten thousandth of a micron, which can effectively remove impurities such as bacteria, germs, heavy metals, and chemical residues. (About 24-36 months to replace)

Level 5: Coconut Granular Activated Carbon, the final taste adjustment for pure drinking water, can absorb odors and release trace minerals to make drinking water sweeter and more delicious. (6-12 month replacement).

Note: The fourth-stage RO membrane is too finely filtered, so the water system must provide membrane osmotic pressure to produce pure water, and the osmotic backup pressure is provided by the wastewater ratio (this element is related to the half-open and half-closed valve). During normal water production, pure water is produced while discharging waste water. The flow rate of the membrane surface is low and easy to block. To ensure the life of the membrane, there must be a period of time without water production. Discharge, this process is backwashing.

The working principle of the filter element of the pure water machine

The first stage of purification: polypropylene melt-blown filter element (PP), which is the first contacting raw water device, with a pore size of 5 microns, can effectively remove large solid substances (such as rust, sediment, algae, suspended solids, etc.) Preliminary purification of water quality.

The second stage of purification: granular activated carbon filter element (UDF), using high-adsorption activated carbon filter element, can effectively absorb residual chlorine, odor, organic matter and other harmful substances in water.

The third stage of purification: compressed activated carbon filter (CTO), deeply adsorbs harmful substances such as residual chlorine, odor, halogenated halogenated Jing, etc. in the water, and further purifies the water quality.

The fourth stage of purification: Mineralization filter element: Add minerals and trace elements that are beneficial to the human body, adjust the pH value, and make weakly alkaline water. .

The fifth stage: Ultrafiltration (UF) filter element, which uses an ultrafiltration membrane with a pore size of 0.01 microns as the core purification process to effectively remove bacteria, viruses, macromolecular organic matter and other harmful substances in water

Level 6: Post-installed activated carbon filter T33, using high-quality coconut shell activated carbon with high adsorption performance, further absorbs odors in water, increases the oxygen content of purified water, and improves taste.

Functions of filter elements at all levels of reverse osmosis pure water machine:

The first stage: PPF filter element

Pretreatment of incoming tap water, filtering out sediment, suspended solids, colloids, impurities, etc. in the water, with large filtration area and dirt holding capacity, good filtration effect, long service life, and can be cleaned and used repeatedly

Second stage: UDF filter element

Absorbs substances harmful to human body such as odor, color, residual chlorine, halogenated hydrocarbons and organic substances in water. KDF can remove more than 90% of the residual chlorine, which greatly prolongs the life of activated carbon.

The third stage: CTO filter element

It can deeply absorb the harmful substances such as sundae color, sundae taste, halogenated hydrocarbon and organic matter in water, and effectively improve the taste of water. The long-life compressed activated carbon and the high dirt-holding capacity of the mesh fabric provide the filter element with dual-function filtration performance.

The fourth stage: RO reverse osmosis membrane

The pore size of the reverse osmosis membrane is only 0.0001 microns, a bacterium must be reduced by 4,000 times, and the infectious disease source must be reduced by more than 200 times to pass, so all the fine impurities in the water\soluble solid\bacteria\ and viruses cannot penetrate too high Precision reverse osmosis membrane. The reverse osmosis membrane separates the water from other impurities and pollutants, the harmful substances are automatically discharged from the concentrated water, and the pure water enters the pressure tank for standby.

The fifth stage: rear activated carbon filter

Further in-depth removal of odor, residual chlorine and bacteriostasis, preventing secondary pollution of purified water, making drinking water more hygienic and safer.

3 points you must know when buying a water purifier

1. Understand the water output of the pure water machine

When purchasing a water purifier, the first and most important point is to understand the water production capacity of the water purifier. Generally, people who sell water purifiers seldom clearly tell customers the water production capacity and its meaning. Most of them simply say how much. gallon. In fact, the water production capacity of the water purifier does not refer to the flow of the faucet, because the flow of the faucet is the water stored in the pressure barrel and then flows out through the faucet, so that flow is not the actual water production capacity of the water purifier. The actual water production capacity of the water purifier refers to the water production capacity of the RO membrane (such a membrane is called 80GPD). It is the real flow of the water purifier, which is rarely explained to customers by the salesperson of the water purifier. After buying a water purifier, customers find that the water volume is not enough, so it is very important to first find a water purifier that is suitable for their household flow. (pure water machine, reverse osmosis pure water machine, working principle of pure water machine, purchase of pure water machine, household pure water machine, laboratory ultrapure water machine)

The water output of the water purifier is expressed in gallons (GPD for short), such as an 80G water purifier, which means that the water purifier can produce 80GPD per day, which is equivalent to 12 liters per hour (one gallon). approximately equal to 3.75 liters). A pure water machine with a water production capacity of 12 liters per hour is completely sufficient for drinking water, cooking and other edible water for a family of 3-6 people. Therefore, when purchasing a water purifier, you must understand the water-making capacity of the water purifier. One is to choose the one that is suitable for your home, and the other is the size of the water production that reflects the price of the water purifier.

2. Choose a pure water machine with a pump or without a pump

There is a lot of publicity about the water purifier without a pump. First, let’s learn about the water purifier with a pump and the water purifier without a pump. The pump of the water purifier plays a function of boosting. Because the principle of RO membrane is reverse osmosis, the precision is 0.00001 micron (one ten thousandth of a micron), and the water pressure entering the RO membrane with such precision can only reach about 0.4MPa. So the pure water machine has only one pump. The pumpless water purifier uses a household ultra-low pressure membrane, and the water inlet pressure is smaller, about 0.2MPa. Because of the different performance of the membrane, the purification effect is not as good as that of the water purifier with a pump. Another point is that the domestic tap water pressure is not stable, so not all users can use pumpless water purifiers at home.

In general, household appliances also have a pump, which is easy to use and can be used even when the water pressure is low. The pure water machine with a pump has a better purification effect than the pure water machine without a pump. It is determined by the performance of its RO membrane. Basically, the RO membrane under the working pressure has better purification effect.

3. Is it better to buy a pure water machine with automatic flushing or manual flushing?

All water purifiers have a flushing function, this function is mainly to clean the RO membrane, mainly to remove the scaling, microorganisms, etc. on the surface of the RO membrane after long-term use, which is a cleaning and protective effect on the water entering the RO surface. In terms of this function on home machines, cleaning is not necessary too frequently. In terms of practicability and environmental protection, it is recommended to use a water purifier controlled by mobile phone cleaning, because the automatic control and automatic cleaning of the water purifier are performed when the machine is turned on. The cleaning time is 10-60 seconds when the machine is turned on, and a lot of water will be wasted during this period, and the cleaning time of the RO membrane of the household machine can be controlled at once every 3-7 days, about 30-40 seconds at a time, and it can be used under special water quality conditions. Wash once every 2 days. And the manual cleaning function is also very convenient, just a switch, just turn it on. Although it is a bit troublesome, it can save a lot of water resources.