Fully portable self-erecting screen tower from GreyStone is positioned as an alternative to permanent or stackable screen supports. Tower uses a horizontal, vibrating three-deck wet screen and is recommended for sand, gravel and aggregate producers that move classifying equipment from site to site at least once per year. Tower takes less than two days to tear down and set up, and it can be moved via semi-tractor. It can act as a primary screen for 6-inch minus material or secondary screen for larger material. It feeds material 3/16-inch minus into a classifying tank and stockpiles up to three sizes.