Line filter
Duplex filter
High pressure filter
The above should be a mesh filter. In fact, there are many kinds of filters, such as lamination filters, sand rod filters, carbon filters, plate and frame filters, activated carbon filters, diatomaceous earth filters, and microporous filters. The main principle is to use the pore size of the filter medium to intercept substances smaller than the pore size of the medium. Of course, some filter media also have special effects such as adsorption. Most of the filters are not so troublesome to backwash, as long as clean water is introduced from one end of the filtered water to the medium in the backwash filter, a good backwashing effect can be achieved.