I'm wondering if burning the dried roots with pebbles would be a good way to recover the pebbles and disinfect them at the same time. I find it to time consuming picking out the pebbles when the roots are still fresh.
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I guess it would work but I think it would also have the effect of covering the pebbles in soot and maybe blocking some of the pores.
But once the roots are dried they're pretty easy to separate and the veg matter floats to the surface if you drop the pebbles in liquid.