This is an 8oz bottle of Five Star beer stone remover.; BS remover is for the removal of beer stone and scale that accumulates on the inside surfaces of brewing equipment and kegs.
Use 1 oz. per gallon of water. Allow a contact time of 10 minutes then drain and allow the surface to air dry. Rinse with clean water and sanitize just prior to next use. For stubborn buildup apply full strength to the area.