When the oil is extracted in the full press extraction process or preparation process, a small amount of solids are expelled with the oil. Oil filtration equipment is supplied in the process to remove these solids from the oil. For smaller capacity plants, oil settling tanks are provided to remove the larger particles of solids. The oil is then pumped to a pressure leaf filter to remove the smaller solid particles. For larger capacity plants, a decanter is typically supplied to centrifugally separate the solids. The solids removed from the oil is conveyed back into the system, mixed with the material and recycled through the conditioner and screw press.