1. The air filter makes the polluted air clean to the state required for production and life, that is, to make the air reach a certain cleanliness.

2. The liquid filter makes the polluted liquid be clean to the state required for production and life, that is, to make the liquid reach a certain cleanliness.

3. Internet filters are set up to block spam, so that the information on the computer screen matches the requirements as much as possible.The principle of absorption separates different colors of light

4. Light filters to absorb unwanted light.The above should be the mesh filter, in fact, there are many kinds of filters, such as laminated filters, sand filters, carbon filters and so on, the main principle is to use the aperture of the filter medium to intercept smaller material than the aperture of the medium, of course, some filter media also have special effects such as adsorption.Most filter backwash is not so troublesome, as long as the water from the end of the filter into the reverse backwash filter medium can achieve a good backwash effect.This type of valve in the pipeline should generally be installed horizontally.