1.

People's living standards are improving day by day, and their concern for health is also rising. Drinking water and food are not only limited to simple food, but also green, pure and healthy has become the criterion of high-quality life.

With the enhancement of people's awareness of healthy drinking water, water purifiers have become daily necessities for many families. There are many brands of water purifier products on the market now, which gives consumers a great choice. However, in the actual purchase process, many consumers report that due to the limitation of relevant professional knowledge, it is difficult for ordinary consumers to distinguish which water purifier to choose. And some manufacturers often advocate some concepts in their propaganda, which makes consumers even more confused.

So how do we choose a suitable water purifier? Bian Xiao believes that the purchase of water purifiers should start from the following aspects:

Look at the brand first. Choose a trusted brand. Big brands have stricter requirements on product quality, stability and after-sales service. The speed of problem solving and the quality of after-sales service are also better.

Second, look at the material. At present, there are stainless steel, glass fiber reinforced plastic, cast iron, aluminum, food-grade resin or PVC on the market. The first three are materials with good compression resistance and can be used as pre-filters (central machines). The latter two materials with poor compression resistance can only be used at the back end of the pre-filter (central machine) as a direct drinking machine. Among these materials, stainless steel has the best compression and corrosion resistance, and its price is relatively high. Food polar resin or PVC has poor pressure resistance and low price.

Third, set the function. When choosing a water processor, you must first make clear your purpose. First, from the big concept, you should say whether it is purified water or softened water. Purifying water is to remove sediment, impurities, bacteria, heavy metals, residual chlorine, organic matter and some minerals from water. Softening water is to remove calcium and magnesium ions from water, and the most direct thing is scale.

Fourth, choose the filter material. At present, commonly used water purification materials include PP cotton, activated carbon, KDF, ultrafiltration membrane, RO membrane (reverse osmosis membrane, reverse osmosis membrane), quartz sand, medical stone, infrared mineralized ball and so on. Different water purification materials will produce different purification effects, and consumers can choose the appropriate water purifier according to their desired purification effects.

Fifth, compare the size. This is the most intuitive way. Generally, the model of water purifier is determined according to the instantaneous water output. More than 1.0 ton/hour can be called a central water purifier, and less than 1.0 ton/hour can be called a direct drinking water purifier. This water output is related to the volume and diameter of the inlet and outlet. Usually, the larger the water purifier, the greater the instantaneous water output.

2. Advantages and disadvantages analysis of household reverse osmosis water purifier

Advantages: The effluent quality of the reverse osmosis water purifier is safe, various harmful impurities in the water can be removed, the effect on water supply emergencies is good, the effluent tastes good, the hardness of the water can be reduced, and no scale is generated after the water is boiled in the container. Disadvantages: Reverse osmosis water purifier needs water pump and electricity. There are electrical safety problems, such as many connectors, high water pressure, relatively high failure rate and water leakage probability, complex structure and high price and cost.

Structure principle of RO reverse osmosis water purifier

Usually, RO reverse osmosis water purifier adopts five-stage filtration, and carries out precise filtration layer by layer to ensure clean and healthy drinking water for the public. The specific structure of RO reverse osmosis water purifier is as follows:

Primary filtration: At present, water purifiers on the market generally use 5μm PP cotton as filter element material to remove large-particle impurities such as rust, sediment and suspended matter.

Secondary filtration: granular activated carbon is used as filtration material, which can effectively remove odor and improve the purity of water. It also has a high removal rate of chlorine, phenol, arsenic, lead, pesticides and other impurities and other harmful substances in water.

Three-stage filtration: the filter material is 1μm, and some manufacturers use sintered activated carbon as the filter material. Strengthen the effect of the first stage and the second stage filtration, and further absorb and remove odor, residual chlorine and fine particles, so as to escort the RO reverse osmosis membrane in the next step.

Four-stage filtration: RO reverse osmosis membrane, made of specific polymer materials, with selectivity. It can selectively permeate some components in water and aqueous solution under the action of external pressure, so as to achieve the purpose of purification or concentration and separation. Because the pore size of reverse osmosis membrane is very small, it can effectively remove dissolved salts, colloids, microorganisms and organic substances in water.

RO reverse osmosis membrane is the main filtration core component of reverse osmosis water purifier, and its performance index directly determines the effect of water purifier.

Five-stage filtration: Post-activated carbon is mainly used to improve the taste of water, further adsorb residual chlorine and increase oxygen content.

3. Classification of household water purifiers

water purifier

If you just want to solve the problem of drinking water, buy this. This kind of water purifier adopts filter element structure, mainly including activated carbon, PP cotton, ultrafiltration membrane and ceramic filter element. According to different requirements, it can be matched with different filter elements, and the price is relatively cheap and the filtration accuracy is relatively high (including ultra-filter elements). But the water yield is small and it is only suitable for drinking. The filter element type water purifier is small in size and is generally installed under the kitchen basin. (Direct drinking water faucet is configured separately, and manufacturers will have it. ).

Central water purifier:

(Suitable for people with high quality of life. All the water in the clean room is purified. ) The central water purifier generally uses activated carbon, KDF, gold filter material and other substances, and installs the water purifier on the main water inlet pipe at home. This model is characterized by large water output, which purifies the water in the home. At the same time, it has backwashing function, long filter life and convenient operation. But the purification accuracy is not particularly high. If it is used for direct drinking, a filter element needs to be installed. The central water purifier is bulky, so the location must be considered before installation.