ChemSpec DFCCLRCS is a calcium, lime, and rust remover for cleaning grout, ceramic, porcelain, and other hard surfaces. It may be used to remove rust from carpet, to clean carpet spray tips, and to de-scale truck mount or portable carpet extraction equipment. This calcium, lime, an rust remover is an acid side cleaner with a pH of 3.5 to 4.5 that becomes neutral when dry to help prevent damage to the hard surface or carpet. It is packaged in 12 one-quart plastic bottles. It is approved by the Environmental Protection Agency (EPA) to meet the Design for the Environment (DfE) Standard for Safer Products, certified to meet Green Seal Standard GS-37 Cleaning Products for Industrial and Institutional Use, and EcoLogo-certified to meet EcoLogo Standard CCD-146 hard surface cleaners for cleaning efficiency and safer use. Special condition: do not use on natural or synthetic marble.Chemical Specialties Manufacturing Corporation manufactures Chemspec chemical products for carpet and upholstery cleaning, stain removal, odor control, and smoke and fire restoration applications in the cleaning, building maintenance, and restoration industries. The company, established in 1968, is based in Burlington, WA.