At 01:23 AM 7/4/2013, you wrote: >So far have sorted out this method of washing pumice. Is there a better >way to wash a bigger quantity at a time? Not commercial quantities >but a sack full at a time. Put it in a wide container, such as a wash tub (basin), and run the hose (hosepipe) into it at a fairly high rate. The fines will gradually wash over the side. Jane McGary Portland, oregon, USA