How finely divided is it when you get it? They said 1/2" to 1" before firing. Does it expnad even bigger, or crumble down to gravel or grit?
www.escsi.org
http://www.escsi.org/ContentPa...
"Originally patented in 1918 as Haydite, Expanded Shale, Clay and Slate Lightweight Soil Conditioner"
I'd like to add some eternal, porous coarse grit with water retention to my beds! It would be even better as coarse fibers or twisted ribbons 1/2" to 2" long, 3-4 mm wide and 1-2 mm thick
I keep thinking about putting some bark strips or nuggets into my microwave to see if they expand or pop, and hold more water while still creating big air spaces.
