Efflorescence is a natural formation that may appear on any concrete or masonry product. It is actually the residue of soluble salts carried to the surface by moisture – a natural by-product of the chemical reaction between cement and water. Efflorescence does not affect the structural integrity and will dissipate over time. It is not indicative of a flawed product. If desired, it can be removed using EF Efflorescence Remover or PW Paver Wash.