Divert problem water away from your home or business. Self-activating flood barriers, simply expose them to fresh water. They absorb water and grow to full size at 3.5" high in 5 minutes. Swelled barriers contain and divert flood water. Leave in place for ongoing protection. Lasts for up to 8 months of continuous use. Safe, nonhazardous and nontoxic, environmentally friendly and decomposes over time.