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A potter friend was telling me about a substance called grog that is
basically fired clay that has been ground up. I'm told the coarsest grade
is larger than sand and has a brown to brownish yellow color. The finest
grade is basically dust. Has anyone else used this stuff? I'm hoping it
will be a cheaper version of Fluorite. a 50 pound bag costs $15. I would
like to set up some test tanks ANY advice would be appreciated. How long do
I need to leave them running for the results to be valid etc.