The durgol by Frieling Collection
In 1951, a forward thinking Swiss inventory, Mrs. Maria Duering-Keller, developed a superior method to remove lime scale deposits. She named her product durgol and founded Duering AG. In 1967, durgol won a gold medal for its bathroom decalcifier at the prestigious Inventors' Fair in Brussels, Belgium. One year later, a decalcifier for metallic items was invented - durgol express. This safe, effective formula has remained essentially the same for more than 40 years! Today, Mrs. Duering-Kellers' company has become the leader in the decalcification market worldwide offering an entire line of specialized products. At Frieling, we stand behind durgol quality and consider it to be the benchmark of the industry.