Mask is a Coal tar based liquid for use in foot baths, on ground floors / soil floors, drains, etc. Mask has a dual purpose : It reduces microbes and is an excellent masking agent. Mask is widely used to remove stubborn germs from sinks, waste bins, and drains. Mask will stain surfaces when used at a high concentration. Product pH at a 1 % dilution is between 2.00 - 3.00.