Mixing and Coverage: One gallon of F9 BARC concentrate makes 1.5 to 3 gallons of cleaner, suitable for 400-800 square feet of concrete. Always mix with clean water before use. Usage Restrictions: Only F9 Authorized Applicators, Contractors, or Maintenance Departments may use F9 BARC. Users agree to these terms upon purchase. Safety and Application: Do not use on glass. Safe for concrete, bricks, pavers, tile, asphalt, and concrete coatings. It is biodegradable, non-abrasive, non-flammable, and safer than hydrochloric acid. Performance: Effectively removes orange battery acid burns, rust, and fertilizer stains, restoring concrete to its natural bright gray color. The product is durable, does not require mixing, brushing, or messy pastes, and maintains its strength over time.