The Osmose Whitening Agent fortifies laundry and softens hard water. This agent is non-toxic, safe for septic tanks, and safe for children, making it ideal for washable diapers. Size: 850 g. Instructions: To soften water, add 60 ml of soda crystals to a regular washer or 30 ml of soda crystals to a High Efficiency washer. To clean washable diapers, dilute a cup of soda and a few drops of dish soap in 20 litres of hot water. Soak the clean layers in this mixture for 48 hours to remove soap residue.