It should be a mesh filter. In fact, there are many kinds of filters, such as laminated filters, sand filters, carbon filters, etc. The main principle is to use the pore size of the filter medium to intercept substances smaller than the medium pore size, of course. The filter media also has special effects such as adsorption. Most of the filter backwashing is not so troublesome, as long as the water is introduced into the reverse backwashing filter from the end of the filtered water to achieve a good backwashing effect.
