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bonsaiTALK Journeyman
Join Date: Nov-2007
Location: hilmar, ca
Country: us
Posts: 38
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dont know about the lava but i found pumice at orchard supply hardware for super cheap. i believe they were in 25lbs bags so not sure how much cubic ft that is but u might give it a try. most of which was usable once sifted and rinsed
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