Abstract: A method of separating a mixture of liquid and insoluble solids in a filter press may comprise: pumping the mixture into a multiplicity of chambers to form a filter cake, each of the chambers being between adjacent filter plates, each of the chambers being lined by filter cloths, wherein, during the pumping, filtrate is forced through the filter cloths and out of the chambers; and releasing dried filter cake from the chambers; wherein the pumping comprises pumping the mixture through a multiplicity of side feed ports and into each of the chambers through a multiplicity of delivery slots, and wherein the openings of the delivery slots into each of the chambers is above the height of the side feed ports. A filter press system is described which includes filter plates and chambers with the aforementioned configuration of side feed ports and delivery slots.