"Dry Stall" is probably the best way to get pumice if you don't live near a pumice mine. The quality fluctuates between larger sized grains to finer sized grains and sometimes there is a bit of grit. I prefer the mix to have just a little bit of grit. The roots seem to prefer that much better, as Dylan said. Nhu On Jul 2, 2013 7:26 AM, "Joseph Kraatz" <plantnut@cox.net> wrote: > I use a product called 'Dry Stall'. Can be purchased at tack shops and > farm supply stores here in S. Calif. Doesn't have fine particles. Joe > >