How to know the quality of the water purifier filter element?
The first filter element of the water purifier, called PP cotton, plays a role in coarse filtering, filtering rust, sediment, and other large particles of impurities.
Generally, when you receive the PP filter element, first pinch it to see the hardness of the PP cotton. The heavier the PP cotton, the higher the hardness, so the higher the hardness, the better the quality of the PP cotton. Because under the same water quality, the softer PP cotton, the life is short, and the replacement cycle is shorter.
The second filter element is granular activated carbon UDF, which is the one that makes a noise when shaken. It mainly absorbs different colors and odors, residual chlorine, and improves the taste, as shown in the figure below.
Generally, this filter element cannot be judged by its appearance alone. There is a difference between coal-based charcoal and coconut shell charcoal. Among these coconut shell charcoal is the best, with good taste and adsorption. Of course, coconut shell charcoal itself also has good or bad iodine value. How to judge? It can be judged from the following two aspects:
First: to distinguish from the sound of shaking, the particles of coconut shell charcoal are relatively fine, so the sound of shaking is relatively small, and the particles of coal-based charcoal are relatively large, and the sound of shaking is relatively loud.
Second: In terms of weight, coal-based carbon particles are relatively large, so under the same circumstances, coal-based carbon will be relatively heavier, and granular carbon will be lighter.
The above is to distinguish from the overall appearance, and there is another method that is more straightforward. The first is to cut the filter element to distinguish the color and size. The coal-based charcoal is dull, the particles are large, and the coconut shell charcoal is shiny and fine. The second is to use activated carbon. Sprinkle it directly in two cups of tap water to compare the bubbling reaction speed and bubble size of different activated carbons.
The third filter element is a compressed activated carbon CTO, which is also called a carbon rod, which is lumpy. Sometimes the third filter element of some water purifiers still contains the same PP cotton as the first one. This is all possible and will not affect the use and effect of the water purifier. The judgment criteria are basically the same, except that the size and gloss of the particles cannot be seen. The main thing is to see the adsorption speed of the water sprinkled on the carbon rod.
The fourth filter element is the reverse osmosis RO membrane, which depends on the brand, that is, the salt rejection rate and stability. HID started to produce RO membrane elements in 2010, and it has been 11 years. The company has been adhering to the principle of pragmatism and diligence, so the RO membrane elements produced are of high quality and low price. The best way to test RO membrane elements is to use a TDS meter to test the TDS value of the water coming out of the RO membrane to judge. The stable desalination rate of HID membrane elements is more than 97%.
The fifth filter element is still activated carbon. Generally, the last filter element is called post activated carbon, which is also granular. The best way is to look at the taste of the water coming out of the tap. The post activated carbon is generally coconut shell charcoal with an iodine value of 1000 or above, which will taste better.