Generally, the slurry that will be separated is injected into the center of the press and each chamber of the press is filled.[1] Optimal filling time will ensure the last chamber of the press is loaded before the mud in the first chamber begins to cake. As the chambers fill, pressure inside the system will increase due to the formation of thick sludge.[2] Then, the liquid is strained through filter cloths by force using comprespressurized air, but the use of water could be more cost-efficient in certain cases, such as if water was re-used from a previous process.