1.Y Filter air filter: The polluted air is cleansed to the state of production and life, that is to make the air reach a certain degree of cleanliness.
2. Liquid filter: So that the contaminated liquid is clean to the production, life needs of the state, that is, to achieve a certain degree of cleanliness of the liquid.
3. Network filter: By setting to block spam information, use the information on the computer screen as far as possible to meet the requirements, with the principle of absorption of different colors of light separation.
4. Light filter: Take away some unwanted light. The above should be a network filter, in fact, there are many filters, such as laminated filter, sand filter, carbon filter, etc., the main principle is that the use of filtration media aperture interception than the medium aperture smaller material, of course, some filter media also have special effects such as adsorption.