Water Activated 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. Contains a super absorbent powder that swells and gels water 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 Protect your home or property in times of flooding with Quick Dam Flood Barriers. Quick Dams expand and activate on contact with water. Just lay them in place and let the water do the rest. Absorb contain and divert problem water away from your home and property, before it becomes a problem. Keep some on hand for emergency situations. Use around doorways, garages, leaking tanks, construction projects, anywhere water is a problem.