Pentra-Sil (C&N) Concrete Neutralizer Treatment cleans and neutralizes concrete that suffers from efflorescence, sweating and other alkalinity problems. Pentra-Sil (C&N) works by infusing lithium ions into the substrate-these ions calm alkali reactions between aggregate and Portland cement thereby reducing the formation of alkali salts and sweating. (For serious problems, we recommend a full treatment of Pentra-Sil C&N, AC and Pentra-Sil.) Pentra-Sil C&N is also excellent for cleaning concrete after diamond polishing. C&N removes fine particles and dust that can reduce shine.