Suitable bonsai soil on a budget

Was editing to add a link to the lab data while you were posting, BTW.

Seems like great stuff, or at least as good as pumice or lava. Totally worth a go for those inclined to spend on it.
Yeah I like the site you linked - it reads well.
The bonsai nursery I visited may have just used it as a media cover/fertilizer.
 
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