New ZeroTol HC is a broad-spectrum bactericide/fungicide peroxyacetic acid chemistry formulated with the smaller grower in mind. ZeroTol HC is perfect for the indoor or hydroponics grower with 500 sq. ft. or less of growing space. It is a no residue, sustainable chemistry that is proven to keep diseases such as Powdery Mildew, Botrytis and Pythium at bay. ZeroTol HC has the ZeroTol name and research behind it, proven to stop pathogens in its tracks.