Anyone know where to buy carbonaceous shale? I plan to use it in a soil mix in place of calcium bentonite and was planning on buying it from rockdustlocal.com but they seem to be out of stock until march and I'd like it sooner. This is what i wanted: https://store.rockdustlocal.com/St-George-Black-40-lbs_p_15.html.
carbonaceous shale
- Thread starter shwamp
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