Natural laundry booster. 20 Mule-Team Borax has a multitude of household uses to help families clean and deodorize their homes for over 100 years. 20 Mule-Team Borax is made of borax which is a naturally occurring mineral compound that is used, not only as a natural laundry booster, but as a multipurpose cleaner. 20 Mule-Team Borax is not harmful to washing machines, plumbing, or septic tanks and does not contain phosphates or chlorine. 100\% borax, a naturally occurring mineral composed of sodium, boron, oxygen, and water. Size: 65 oz.