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Some years ago I was at the Synchroton near Chicago and an engineer was complaining about the temperature of his pool after winter and how to heat it.
I told him about the aussie solution. Just put a huge spiral of poly pipe on your roof and pump the pool water through it with the pool pump.
Six months later I was there again. This same engineer told me you could not buy poly pipe all the way to Idaho as every man and his dog were doing it..
Bert
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