Quick Dam Sandless Sandbags - 12in x 24 in - 20/Box

Quick Dams activate and grow to 3.5 inch high sandbag in minutes with a contained super absorbent powder that swells and gels when wet. Compact, lightweight, ready to use and no sand needed. Simply place in the path of problem water and watch a Quick Dam quickly absorb 4 gallons of water. Easily stacks in brick or pyramid formation to build a retaining wall. Provides continuous protection for several months, if needed. Not for salt water use. Reusable. Environmentally friendly. Black. Bag / 20.