A recessed plate filter press is made up of polypropylene squares at about 2 to 4 feet across with a concave depression and a hole in the center of each.[8] Two plates join together to form a chamber to pressurize the slurry and squeeze the filtrate out through the filter cloth lining in the chamber.[9] It is capable of holding 12 to 80 plates adjacent to each other, depending on the required capacity. When the filter press is closed, a series of chambers is formed. The differences with the plate and frame filter are that the plates are joined together in such a way that the cake forms in the recess on each plate, meaning that the cake thickness is restricted to 32mm unless extra frames are used as spacers.[10] However, there are disadvantages to this method, such as longer cloth changing time, inability to accommodate filter papers, and the possibility of forming uneven cake.[10]