The rectangular shape just doesn’t make sense, the water wouldn’t have flowed as well compared to the circular PVC we use and why were they metal? It’s rigid hard to move, not particularly aesthetic and if you want to cut it it’s quite a chore.
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PVC is plastic. Plastic has barely been around for more than a hundred years, but metal has been around for millennia. Also it is a lot easier and quicker to slap four rectangular sheets of metal together than it is to craft round tubes, plus many people do find rectangular shapes fit the form of a rectangular building aesthetically, plus it moves water all the same.
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