My best guess is no but I'll let others chime in on that question. Gypsum (crushed and in a different form) is often added to clear water when clay particles are suspended in the water column.

http://srac.tamu.edu/tmppdfs/1429457-460...27e67b5704b4d1c

Last edited by Shorty; 06/03/08 10:19 AM.