Granulated Basalt

Yes - I use basalt - paramagnetic rock dust. Quite a bit to my soil mix actually.

Like 4-6 cups per cubic foot (7.5gal soil mix).

I use whats called flour its pretty fine grind. Not granulated but flour.

This is how we simulate the clay layer in a natural soil but in a container.

The granulated is too course.
 
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