1.84kg box, all natural. The only ingredient in Borax is a naturally occuring mineral called sodium tetraborate. It's free of phosphates, chlorine and other chemicals. While most people know Borax for its cleaning abilities (especially in the washing machine), it has many other uses as well, including odor control, DIY crafts, and more. First sold in 1891, 20 Mule Team Borax™ has been used safely by families all over the U.S. for over 128 years.