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Milkcrate Composter (vertically stacked)
French Drain with Dry Well
Installing a French Drain
Simple DIY Wormery (IKEA Hack)
Low cost energy efficient fermentation device
So then does the newly composted dirt fall down to the bottom layer? You've explained how it's used the first time but not how you'll use it from then on...
Multi-Layer Vermiculture Bin
Dog Waste Digester Bin
Make a Compost Bin From a Wheelie Bin