The invention consists of a filter, device for joint to a pipe, and two devices at the extreme ends. At the upper end is a system for loading the compd. assembly of the valve system. At the lower end is a perforated plate on which is placed a filtration screen. Below this screen is placed another valve. The upper/lower system of valves allows one to proceed with the filtration under vacuum or pressure from a form if there are effective filtration studies, and is able to simulate the lab. scale to operate the filtration on an industrial scale.