We developed this years ago for safer handling of mercury amalgam! Made of PVC which you attach to an air compressor or bicycle pump, using only 12 lbs. of pressure. It pushes the mercury out and leaves the amalgam on the filter. Safer to use than retorting as there are no mercury vapors. Comes with a 4 micron polypropylene filter and stainless steel screen. Holds 15 lbs. of mercury.