... 3, Can be used perennially and repeatedly, have a good function in saving water and powerFeaturesNo hazardous substance remains after ... various kinds of bacteria.Get rid of bad smell in cloth & washing machineHow to use :1,put ... , Clean the balls every month, dry it in the sun.Packing 1pc/opp bag/color box 50pcs ... 4, Suggestion: no use to industrial use or large-scale washing such as laundry shop, but can ...