Posted by Mike McClintock [66.82.162.20] on Wednesday, May 02, 2012 at 23:20:55 :
In Reply to: what would be a good medium? posted by Glen Id [72.173.87.91] on Wednesday, May 02, 2012 at 22:14:46 :
Try #8 or #9 clean crushed limestone.
Around here #8 is 3/8" and #9 a little finer. #12 sieve I think.
MM