I built one of these things yesterday. I used two bins left over from my in-laws move. They were only two thirds the size but hopefully it will work anyway. I used a plastic flower pot (that I drilled a bunch of holes in) instead of the pond pot since I couldn't find one. Ordering the pond pot online is definitely the way to go. I am not growing tomatoes in it but hopefully it will work for the vegis that I planted.
PVC marked NSF-pw is safe for potable water.
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