They are made out of ferro-cement – remesh, rebar and lathing that is stuccoed with concrete.
The grey water from the kitchen and bathroom will be routed into these and we will be able to grow year round.
At present, they have coarse gravel in the bottoms, which will help clean the water, as will the plant roots themselves. Once we do plumbing, we will then be able to fill them up with a rich compost soil.
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