Hydrofarm PSPH20 Physan 20 Broad Range Disinfectant, 128-Ounce PHYSAN 20 is a broad range disinfectant, fungicide, virucide, and algaecide Effectively controls a wide variety of pathogens on hard surfaces and plants It is an EPA approved concentrate formulated with unique germicidal agents It poses no human or environmental risk when it is used Controls disease spreading organisms which can be carried from plant to plant