Ecozone soap nuts are economical and effective they save you money by replacing washing detergents the 1kg organic cotton bag holds enough soap nuts for 330 washes which is an average of 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 soap nuts grow on trees of the sapindus genus and are a source of saponin a natural surfactant which cleans and freshens your clothes