Roots Organics Phos Bat Guano is an excellent source of phosphorus and calcium that will encourage vigorous flowering and fruiting on a variety of plants in your grow area. This superior guano has been carefully sourced for quality, harvested with bat friendly methods, and sifted to make it easy to work with. Roots Organics only uses 100% naturally occurring Bat Guano. No additives. No filler. Quantity: 3 lbs.