Comment by Kobus Jooste on October 23, 2011 at 10:16am
Bob - the media is a mixture of virgin pvc granules used in plastic moulding and vermiculite. I heat the pvc hith a heat gun to get them a bit sticky, which then causes a bit of nodule formation if you get it right (kind of like a peanut brittle). I was looking for something light and cheap. It does work out a bit cheaper than clay balls
Comment by Bob Grinder on October 23, 2011 at 9:15am
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