A friend who wants to buy a water purifier will definitely be unable to do anything after seeing the water purifiers on the market. I don't know which one to choose, or which one is best for my needs.
1. Is the water really dirty? What can be used for various water purification equipment?
The common water filtration methods on the market include microfiltration, ultrafiltration, nanofiltration and RO membrane water purifiers. The following substances may be included in the tap water. The filtration capacity is as follows:
Imagine different impurities as fish of different sizes. Different filtering methods are fishnets with different pore sizes. The pore size is expressed as follows:
Therefore, in order to solve different water quality problems, the corresponding equipment must be selected.
2. What water purification equipment is available on the market, and what problems are solved separately?
Multi-stage ultrafiltration Machine
Main use: Effectively filter out harmful substances such as sediment, rust, bacteria, colloids, macromolecular organic substances in water, and retain minerals and trace elements beneficial to the human body.
Advantages: completely remove bacteria and algae including some viruses, and can safely drink where the metal ion content is low (but it is recommended not to quote directly, the quality of Chinese tap water, really...).
Disadvantages: Can not filter out calcium and magnesium ions, the scale is still scale.
Usage: The filter cartridge is replaced regularly, and the replacement cycle of different filter cartridges is slightly different.
Water Softener
Main use: By using the ion exchange principle, the calcium and magnesium ions in the water are replaced by Na+ in the sodium salt in the machine. Thereby obtaining soft water.
Advantages (the advantages of using soft water are too obvious):
1, the bathroom mirror has no water stains, so scrub;
2, cotton clothes or towels washed and dried will not stiffen after the knot, after repeated washing will not be so easy to dim, yellow;
3. The water heater, solar energy, humidifier and other pipelines are no longer blocked, the flow is reduced, and the service life is shortened;
4, bath or toilet and other equipment is not easy to yellow;
5. The faucet and shower are no longer full of scale, and the chrome-plated surface is no longer stained with water;
6. After bathing, the skin is dry, rough, itchy, dry and knotted, and it is difficult to comb and have a certain degree of relief;
RO reverse osmosis water purifier
Main use: generally have five layers of filter
Advantages: It is cleaner than ultrafiltration.
Disadvantages: 1, consumables, or consumables. 2, RO opportunities to produce wastewater, will cause a certain amount of water waste, that is, the water efficiency is not too high (those who think that the RO machine filter is the most cattle, so the whole house water can use RO filter, the local tyrant can rest, the courtiers do not Arrived).
Fools purchase guide
Knowing the introduction of the above various machines, how to combine these products, the corresponding role is very obvious. We divide the waterway roughly into three roads.
Direct drinking waterway: the most thorough filtration is required. It is best to choose RO membrane water purifier;
Kitchen waterway: general filtration, no need to consider soft and hard water problems, you can choose ultrafiltration machine;
Shower and washing waterway: It is best to use a water softener.
3, frequently asked questions
Q: The RO machine completely filters out the minerals contained in the water. Is it often bad for the body to drink this water?
A: There are many substances in the water, but the content of these substances is very small. There are more minerals in the water, more than the amount of food you eat?
Q: RO opportunities to produce wastewater? What causes these wastewaters?
A: There are two main sources of wastewater: washing wastewater and filtering wastewater.
Flushing wastewater is used to flush the RO membrane, which is usually washed when the machine restarts the water, thus avoiding the RO membrane being blocked and prolonging the service life of the RO membrane;
The filtered wastewater is a retentate that is trapped by the RO membrane after the tap water is filtered. According to the pure water recovery rate of about 30% set by the general manufacturer, if 15L of pure water is used in one day (the drinking water and cooking can basically meet), 35L of wastewater will be produced, and the total water consumption will be 50L, and the total wastewater will be 1.05 in one month. Tons (35L*30=1050L), according to the current Beijing water price of 5 yuan / ton, the wastewater generated in a month is more than 5 dollars.
Q: Does the soft water opportunity attenuate the water pressure?
A: Does not attenuate water pressure. The water pressure of 1.5-3 kg can be used normally. Generally, the tap water pressure is 2-4 kg.
Q: Does the water softener consume power? Is it good?
A: The power consumption is 3W (just like a mobile phone charger, it is 1 degree in one month). The wastewater is also below 5%, and the water yield is above 95%. The salt is about 1 kg of salt in 1 ton of water (the amount of salt is different depending on the hardness of the water).
The water softener is fully automatic and requires no manual operation. You only need to add salt once to the salt tank for 3-6 months. (The model has different salting time).
Q: Can the water from the water softener be drunk directly? Why?
A: It is best not to drink, because the soft water machine simply removes the water alkali (calcium and magnesium ions) in the water, and cannot remove harmful substances such as heavy metals and residual chlorine in the water.
Q: Will the water from the water softener be cleaned with salt?
A: No, because the salt only acts as a flushing machine. After washing, the machine will drain the salt water. If the water used in the effluent is salty, check whether the rinsing time is too short. At this time, you can adjust the rinsing time; or if you use water during the regeneration process, so that salt water enters the pipeline. At this time, you can put more water for a while.
Q: I am using the floor heating in my home. I heard that the floor heating is very difficult to clean. Is it necessary to pass the water softener first?
A: It is true that the floor heating water is preferably softened. If it is burned in your own boiler, it will be OK to install it before the boiler. If it is residential heating, hot water into the household, you need to consider the appropriate temperature range of the machine.
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