The worms work their way up the tower, eating organic material and releasing their waste. The waste falls to the bottom, and we harvest that, using it to fertilize our vegetables. It is the richest fertilizer you can find, and has many worm eggs within those nutritious castings. This will allow for the continuing the life cycle within the soil of our crops.
For directions on how to build your own, click here : http://pittsburghpermaculture.org/hardware/how-to-stacked-worm-composting-for-15
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