Joe Kuhn wrote:

Hi,

I use crushed lava here in Mobile, Al. The key to it being used successfully is to rinse it with fresh water. This gets rid of the dust. I put regular window screening in a plastic milk crate and run water over it till it runs clear. I turn the stone over by hand while doing this also. If you don't get rid of the dust it will settle in the bottom of your pot and harden, blocking drainage. Good luck.

Joe
even Akadama has to be sifted and free form "dusts" and
particles of 1-2 mm i