[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

grog substrate

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.