getting spherical and uniform substrate grains from non-uniform grains. DIY?
I was thinking of making a DIY "tumbler" and using it to process some soilmaster select charcoal or perhaps larger grained substrate. This would involve tumbling the soilmaster in a cylinder for a period of time (week) until the grains have eroded and sanded each other into more uniform spherical shapes. Granted, it would create a lot of waste dust, but, it's just for aesthetic purposes. I am not sure if there are any biological advantages to having round uniform grains.
Any thoughts or suggestions on this idea>?