The water quality in every place is different, so consumers should know the local water quality in advance when purchasing water purifiers, so as to make more targeted choices.

In the high hardness water quality in North China and limestone areas in South China, the content of calcium and magnesium ions in water is high and it is easy to scale. Therefore, it is necessary to buy advanced filtration water purifier and ion exchange resin filter element.

In cities, water contains more chlorine, different colors and smells, and contains more organic matter, so you can choose a household water purifier with a large activated carbon load. Because activated carbon has a strong adsorption effect on residual chlorine and odor in water, it has obvious removal effect on organic matter.

For the purification of tap water with turbid water quality in urban and rural areas, a household water purifier with dual functions of coarse filtration and fine filtration should be purchased. (Related article: Buyers need to know the water quality before using the water purifier)

Second, buying a household water purifier depends on the hygiene approval.

If you buy a water purifier, you must choose a product with health approval. According to the Measures for the Supervision and Administration of Drinking Water Hygiene, units and individuals that produce and design drinking water hygiene and safety products must apply to the administrative department of public health of the government for the approval document of product hygiene license in accordance with regulations, and only after obtaining the approval document can they produce and sell. Some merchants' products have passed more authoritative professional certification bodies, such as national sanitation foundation (NSF) certification.

Third, the choice of household water purifier depends on the filtration method.

The filtering mode of the filter element can be said to be the standard of the effect that a water purifier can achieve. Various harmful substances in water, such as chemicals, odor, chlorine, chloramines, bacteria, spores, scale, impurities, mercury, lead, mercury and other pollutants, will still be cited by people if they are not filtered thoroughly, so thorough filtration is very important.

At present, there are five filtering methods:

1, granular activated carbon filter element: it can remove residual chlorine, chloroform, bleach, pesticides and other chemicals in water and different colors and smells.

2.PP cotton filter element: used to filter iron filings, silt, hair, sandstone, floating objects, etc. Generally, it is used as the primary filter element of water purifier, so its service life is relatively short.

3. Ultrafiltration membrane filter element: It can remove impurities such as bacteria, colloid, organic matter, virus, etc. larger than 0.0 1 micron in water to ensure water safety.

4. Post-activated carbon composite filter screen: Post-activated carbon adopts food-grade coconut shell, which has better adsorption effect. Adding space nano-whiskers, the antibacterial effect is efficient and lasting. Put the last level of drinking water.

5.RO reverse osmosis filter element: Using the principle of reverse osmosis, pollutants harmful to human body such as inorganic salts, heavy metals and microorganisms are separated from pure water.

If it is reverse osmosis, it depends on the proportion of wastewater.

The proportion of pure wastewater is mainly in the water purifier. At present, the national requirement does not exceed 1: 2.3. A cup of pure water can't discharge more than 2.3 cups of wastewater, but most manufacturers are at 1:3, or even higher, which leads to an unnecessary increase in water charges at home.