The pro-level Heavy-Duty Floor Stripper Concentrate is fast-acting and ammonia-free. The concentrated, high-alkaline formula goes on quickly with a scrubbing machine or a cotton mop and commercial mop Pail with a wringer, then digs deep to remove stubborn finishes and heavy buildup in preparation for a new finish. It is perfect for use in offices, businesses and warehouses. One gallon of concentrate makes nine gallons of floor stripping solution.