TEC231 Carpet & Upholstery Extractor Shampoo with Anti-Scaler offers all the same benefits of TEC232 with a keep clean anti-scaler. TEC231 Carpet & Upholstery Extractor Shampoo with Anti-Scaler is designed for use in all carpet extractor machines. TEC231 is a phosphate free, low foaming detergent which does not leave a soapy residue behind. TEC231 works with hot and cold water. TEC231 is a carpet and upholstery shampoo PLUS it also helps clean your extractor clean when used regularly. It also reduces and prevents the scale build up throughout the machine. Biodegradable.