Efflo-Remover® from Seal n Lock is a synthetic acid which is a 100% bio-degradable and non-corrosive which is used to remove efflorescence (a whitish chalky residue that is sometimes apparent on the surface of the pavers) from the surface of the pavers. Our efflorescence remover is user friendly and environmentally safe just like our Bio-Strip® paver sealer remover and other paver and patio sealer products.