CedarTech uses CedarSilver to protect your roof. CedarSilver is completely biodegradable and environmentally compatible. It is safe for your gutters, downspouts, lawn, shrubs and the concrete surrounding your home. It is virtually odor free. CedarTech has been used in numerous sensitive applications including Inn at Otter Crest , the Leach Botanical Garden, and Multnomah Falls Lodge, and will not injure animals – wild or domestic.