An automatic filter press has the same concept as the manual filter and frame filter, except that the whole process is fully automated.[7] It consists of larger plate and frame filter presses with mechanical "plate shifters".[3] The function of the plate shifter is to move the plates and allow rapid discharge of the filter cakes accumulated in between the plates. It also contains a diaphragm compressor in the filter plates which aids in optimizing the operating condition by further drying the filter cakes.[3]