I have never considered alum. However, I did research gypsum. Take a look on this area at the Calculating Gypsum Amount thread and my April 19 post regarding an answer to my questions from US Gypsum.


It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa