Physan 20 Greenhouse Disinfectant is an algaecide, fungicide, bactericide and virucide with an incredibly wide range of applications. Use Physan 20 to control algae anywhere in the greenhouse including floors, walls, walkways, benches, trays, pots, wicks, capillary matting and buckets. Use it on algae in fountains, decorative water displays, pools and evaporation coolers. Physan 20 can be used to treat a variety of diseases affecting lawns, turf, and grass, including Fairy Ring, Dollar Spot, and toadstools. Not recommended for edible crops.