So2 Pad for Bottom

The use of Bottom pad assures uniformity  in So2 concentration all sectors inside the box.It is placed at the bottom of the box,together with  SO2 Generator at the top of box. is a device consisting of two barriers of paper with polyethylene, which contain active ingredient sodium metabisulfite (Na2S2O5), between these two sheets, which on contact with moisture it generates sulfur dioxide (So2) gas.