Filter is a small equipment to remove a small amount of solid particles in the liquid, which can protect the normal work of the equipment. When the fluid enters the filter cartridge with a certain specification of filter mesh, its impurities are blocked, and the clean filtrate is discharged from the filter outlet, when it needs to be cleaned, it is only necessary to take out the removable cartridge, and then re-install it after processing, so it is extremely convenient to use and maintain it.