A look at the filter material
The main air filter paper filter material is now used mainly domestic paper filter paper and imported paper, whether domestic or imported paper is a good filter performance, and low-quality counterfeit filter paper used, can not prevent dust from entering the engine, thus affecting engine working properly. Generally genuine filter paper color uniform, relatively flat paper; filter paper and inferior color is not uniform, the paper scared, poor texture.
Second, look at the filter of glial
Today, the general structure of the filter paper and rubber adhesive composition, but also genuine filter glial differentiated. Genuine rubber texture better filter, flexible, rubber and counterfeit cartridges weak, poor texture. The method is relatively easy to identify the air filter on the break, soon after the release of genuine cartridges restitution, while the rubber texture problem of counterfeit cartridges, and paper bonded well, traces of the middle fold obvious.
Also: You can identify a number of such imports with lined, of course, and some go-made imitation, but a closer look is not the same.
We all know that the first-stage water purifier is PP filter, also called meltblown PP, the material is polypropylene (PP material), the main role is to filter tap water larger than 1 micron in diameter harmful impurities, minerals miscellaneous organic pollution etc. because there is no sewage functions, its life is generally 3-6 months, so the filter should be changed regularly, otherwise it will cause secondary pollution, water quality, no way guaranteed. According to the scope of use can be divided into 10-inch -40 inch range, according to the special requirements, density, length and weight to be customized. Look at the density difference between the aperture of PP can be divided according to 1um and 5um, but also look at the weight of 100g and 110g or so, aperture naked eye can not identify, weight and feel are able to distinguish the hand. Filter direct impact on the quality of water purifier and filter effects, it is generally the usual 1 and 5 micron, heavy as the last choice. And because the former PP cotton filter is generally three to use, so be sure to regularly replaced, otherwise TDS value life and water quality will affect the RO membrane.
 PP cotton filter that is hard or soft good is good? In fact, the higher the density of pinching up strong, it means that compression is high filtration precision and longer service life are rather large soft PP in water pressure or a long time after use might spread, resulting in decreased filtration impact normal operation of RO machine, so the quality and price are the dominant PP in order to enhance the quality of the entire water purifier fundamentally.