Ecozone Soap Nuts are economical and effective, you can save money by replacing traditional washing detergents. The 1kg cotton bag holds sufficient Soap Nuts for up to 330 washes, which is on average 3p per wash. Soap Nuts have been used for thousands of years as a natural washing detergent by people native to both Asia and the Americas. Also known as Soap Berries the nuts grow on trees of the Sapindus Genus and are a source of Saponin, a natural surfactant which cleans and freshens your clothes. Soap nuts are gentle on your clothes, colours stay brighter for longer, whilst effectively removing dirt.