Based on the current situation of tap water in China, many friends want to buy household water purifiers. When they buy them, they have a common question: what kind of household water purifier is most suitable for China's own water quality? To answer this question, we need to clarify two questions:

1. What is the situation of water quality in China?

1. Serious pollution of water source: with the increase of population, the development of industry and economy, the pollution of surface water system is becoming more and more serious. The factory sewage and domestic sewage make the country's high-quality water source reduce continuously. The groundwater pollution is more shocking. The landfill, septic tank, mine pollution and the factory's underground sewage make nearly 60% of the country's groundwater quality "poor".

2. The process of waterworks is backward: most waterworks are still "coagulation sedimentation filtration disinfection", which can only remove the colloid in the water, can not remove the heavy metal, can not remove the soluble organic pollution (only a small part can be removed), and chlorine disinfection will produce the harm of residual chlorine.

3. The secondary pollution is serious: the water distribution network is unqualified and aging, and the water storage tank for secondary water supply has been unattended for a long time, which makes the poor water quality even worse. Algae, rust, heavy metals and bacteria are mixed in one after another.

Therefore, we can say that the tap water now contains all kinds of harmful substances. It is impossible to drink raw water and boil it.

2. What are the water purification processes of household water purifiers? Which can thoroughly solve the water quality problem of tap water?

At present, the domestic water purifiers in the market can be divided into two categories:

1. chemistry

Commonly used are ion exchange resin and KDF (copper zinc alloy), the former is mainly used for softened water, the latter is used for sterilization and removal of heavy metals, but the purification effect is closely related to the content and water quality, so the effect is not guaranteed.

2. Physical class

It can be divided into two categories: adsorption and filtration. Adsorption mainly uses the super adsorption capacity of activated carbon to absorb harmful substances in water, but it can not guarantee 100% adsorption, and the adsorption effect is getting worse with the use time.

According to the precision from low to high, it is divided into coarse filtration, microfiltration, ultrafiltration and RO reverse osmosis. Only ultrafiltration and RO reverse osmosis can remove most harmful substances in tap water, while ultrafiltration can not remove heavy metals, organic pollution, calcium and magnesium ions (scale).

Therefore, for China's water quality, only the pure water machine using RO reverse osmosis technology can meet the direct drinking standard, and the ultrafiltration machine is a little reluctant.

Therefore, the purchase suggestions given by epland water purification experts are:

1. If it's for direct drinking, it's recommended to buy ro ro ro RO water purifier first, unless you are very confident about the quality of tap water at home. Here are some points to note:

① Pure water machine need electricity, need to install more space, will produce waste water;

② The water output of pure water machine is low, which is too luxurious for domestic use;

③ Drinking pure water has been proved to be nonsense;

④ The performance of the water purifier is determined by the grade of RO reverse osmosis membrane. Although the domestic RO membrane is cheap, its service life and effect are poor. The imported RO membrane from Dow and South Korea are better.

2. If it is for domestic water, such as washing vegetables, washing clothes, bathing and washing, and the budget is limited, the ultrafiltration water purifier can meet the demand, with large water output, low price and simple maintenance, but it can not be directly drunk. Areas with low risk of heavy metal pollution can also be used as drinking water, but ultrafiltration water purifier can not remove scale.

3. The hardness of water in the north is generally high, and hard water is not good for human skin and various cleaning activities, so friends with conditions can install a central water softener to soften the daily life water.

4. If possible, the prefilter can be installed to protect the domestic water appliances and prolong the service life of the filter element of the pure water machine.