Since July 1, 2012, my country has implemented the "new national standard" for drinking water, and the detection indicators have increased from 35 to 106, basically achieving the drinking water standard in line with international standards. In order to widely publicize the knowledge of drinking water sanitation and raise the public's awareness of safe drinking water, starting from 2012, China has designated the third week of May each year as the drinking water sanitation publicity week.

Today let's take a look at the water purifiers that are closely related to drinking water filter.

1. Pre-filter

The filter accuracy ranges from 5-300 microns depending on the brand and model. It is suitable for areas with poor water quality, and can not be installed in areas with better water quality.

Advantages: The pre-filter can effectively filter the large particulate matter such as rust, sediment and algae mixed in the tap water during the pipeline transportation.

Disadvantages: The purification function of water is limited, and it cannot filter out microorganisms such as bacteria in tap water, but it can protect water appliances such as water heaters and dishwashers to a certain extent.

2. Water softener

Two soft water technologies: one is to remove calcium and magnesium ions in water through ion exchange resins to reduce water hardness; the other is to package calcium and magnesium ions in water into crystals through high-energy polymer balls to exist in water, so that No scaling in water.

Advantages: Soft water for bathing, shampooing, washing face, smooth and delicate, especially for the skin of infants and young children. Soft water washing clothes are clean, fluffy, bright, without residual washing and smell, and the life of clothes can be extended by more than 15%. Soft water wash dishes, tea sets, washbasins, tubs to minimize stains, save detergent and rinse time.

Disadvantages: The water softener can only reduce the hardness of tap water, and cannot remove harmful substances in the water. So there is no problem as daily water, but it cannot be directly consumed.

3. Ultrafiltration water purifier

Equipment for purifying water with ultrafiltration technology. The difference from other water purification equipment is the use of ultrafiltration membranes.

Advantages: The purification accuracy is 0.01 micron, which can remove colloidal particles, sediment, ultrafine particles, heavy metals and bacteria in water.

Disadvantages: The water purified by the ultrafiltration water purifier can be used to wash vegetables and cook, but it cannot be directly drunk like the water of the water softener. If you want to buy an ultrafiltration water purifier at home, it is best to boil it before drinking.

4. Nanofiltration water purifier

The water purifier is a water purifier that uses a nanofiltration membrane to take the pressure difference as the driving force, and the filtration method is the nanofiltration membrane. The purification accuracy is 0.001 microns, which is between ultrafiltration water purifiers and reverse osmosis water purifiers.

Advantages: The nanofiltration water purifier can not only filter out all the substances that the ultrafiltration water purifier can filter, but also filter out heavy metal ions in the water, making it safer to use. Different from the first three water purifiers, the water filtered by the nanofiltration water purifier can be directly drunk.

5. Reverse osmosis water purifier

The highest precision of all water purification equipment, also called pure water machine, has a purification accuracy of 0.0001 microns. A set of water purification system is mainly composed of filter and reverse osmosis device, as well as dosing and disinfection device.

Advantages: The reverse osmosis water purifier can filter out almost all inorganic salts, organic matter, bacteria and viruses in the water. The water treated by the reverse osmosis water purifier can be directly consumed.

Disadvantages: The utilization rate of water is low, and the wastewater ratio of most reverse osmosis water purifiers on the market is about 40%.

With so many types of water purifiers, which one is the most suitable for your home?

1. Choosing a good water purifier depends on your own needs. If you just want to filter impurities out of the water, then a coarse filter will do. If you want to remove bacteria and other microorganisms in the water and retain the original minerals in the water, you can choose a water purifier with ultrafiltration as the main technology. If you want the treated water to be free of any substances and not have any impact on its use, choose a reverse osmosis (RO) water purifier.

2. Nanofiltration is a technology between reverse osmosis and ultrafiltration. It can allow some organic salts to pass through the nanofiltration membrane (usually small molecule ions, such as sodium, potassium), and prevent large molecules, high price The metal ions pass through the nanofiltration membrane.

3. Electrolyzed water, energy water, weak alkaline water, and active water are just a concept hype by merchants. Products with these words are generally synonymous with high profits, which have no practical effect, and those so-called The substances used in the energy filter have not been studied for safety, so you don't have to consider them when purchasing a water purifier.

4. TDS (total dissolved solids in water) is not a standard for measuring the quality of water quality. As long as it does not contain harmful substances and has suitable hardness, it is good water. Mineral water is a good example.