Quick Dam Water Activated  Flood Barrier 5 feet, 1-Pack Water Actived Flood Barriers, Rated #1 in Flood Control Grows to 3.5in high in minutes, just get them wet Long, flexible design creates all sorts of shapes Use to control, contain & divert flood water Ready to use, no sand or labor needed Compact & Lightweight, stores away until needed Use to protect doorways, garages, leaking hot water tanks, erosion control & more Dual chamber design prevents unit from rolling out of place Use indoors or out Do NOT use with salt water, chemical reaction causes deflation