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Hey Doug,
What interested me about a plenum was the mini-cycle of nutrient breakdown at the sand bed level, as the material cycles through the sand bed into the plenum then back up again. The concept of a 'chemical sink' driving material breakdown in a loop until the end result is as if the material was burned, CO2O, water, and trace elements. Seemed efficent and natural.
I read everything from plenums pose no benefit, to where plenums cause problems. What convinced me was a pamphlet called 'Secrets of a Living Sand Bed'. This explained the benefits and implementation pretty well.
So, I'm going for it. The plenum will be implemented in conjuction with a 5 inch sand bed.
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