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A recycled compressor tank, or propane tank is a better solution. Just cut a 2" hole in the top and weld a 2" tapered thread female to it, then screw on a fuel tank cap adapter, which you buy at an auto parts store. The fuel tank cap is vented, but maintains a 4PSI pressure differential...

Poly tanks are sensitive to UV, but painting them black is a good idea to reduce UV damage while increasing IR gain. They will get stiff in the winter, and more likely to crack after a few years outside, so you may want to plan on replacing them every few years. Keeping your settling tank warm...