Helps to optimise the use of the laundry liquid and washing powder in varying water hardness areas. The main ingredient of the softener is Zeolite A (sodium aluminium silicate), which consists of two raw materials, sodium silicate and sodium aluminate. According to the ion-exchange principle, this silicate traps the calcium and magnesium ions responsible for hard water. This \'softens\' the water allowing any residues to be safely removed from the fabrics and getting better results from using less detergent. Free from fillers, phosphates and other substances made from crude oil waste products such as NTA and EDTA. 100% bio-degradable. Sonett Water Softener - 500g is part of the range of Sonett natural laundry products. Keep your laundry looking and smelling fresh and new with Sonett\'s collection of laundry essentials, from laundry liquids to stain & odour removers. Explore the full range of Sonett products, including organic hand soaps and Sonett dishwashing products, available from Big Green Smile.