Pro BRC (Building Restoration Cleaner) concentrate will clean brick, masonry and concrete without damage when used as directed. Will remove efflorescence from brick and stone. It will work in cold water as well as hot. It can be used in hand pump or pressure washers. This product must be diluted before use. Follow label directions carefully and use required safety equipment. Contains Hydrochloric Acid. Buying more than two gallons will require paying an additional hazmat fee.