My 3rd system around the farm. I used old tin that was laying around, bent it in a rectangle shape and filled it with dirt. I left about 6 inches of the top empty and filled with rocks. I found the pool liner at the dump, the house on top of the fish tank i made a few years ago for the dogs, out of old pallets and old scrap tin. Buried a tote cut off at the top in the ground. I've got catfish in it, with a pump inside the house, surrounded by bricks and styrofoam. I have less than $75 total in this system.
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