BioSafe Systems pioneered the development of its proprietary Activated Hydrogen Peroxide with its flagship product, ZeroTol. Using ZeroTol chemistry, ZeroTol HC is available for the backyard gardener and hobby grower. Working through oxidation, ZeroTol HC penetrates the cell walls of plant pathogens, killing them instantly. This product has been a staple in farm and ag, turf and ornamental and greenhouse and nursery industries. Safe to use, EPA approved and bee friendly. Kills mold spores before they turn into pathogens. Contains no copper or harsh chemicals Leaves no harmful residue Kills diseases on contact Biodegradable and Sustainable.