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Post by jeff on Oct 20, 2017 21:34:56 GMT
Instead of gravel, they used expanded clay spheres, like from hydroponics, filled with food and bacteria that, when a crack fills with water, the bacteria fill the crack with Calcium Carbonate. youtu.be/lC8x6oEhhZI
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Post by thebastidge on Oct 23, 2017 17:42:19 GMT
Light weight aggregates like expanded vermiculate, perlite, and scoria would probably work as well, coated/soaked in the same stuff.
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