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My family has decided that we should get a hot tub and the only arguments I can come up with are that they're 1) expensive, 2) a hassle, and 3) a giant energy sink, all of which they care little about.
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Well there is also the bacteria content.
From here:
http://www.mayoclinic.com/health/hot-tub-lung/AN00660
I have heard (but have no source) that the fungus that grows inside the tubing is resistant to even direct bleach application for a limited time, and of course you have no way to get bleach into those tubes. Unless you are going to fill the whole tub with it.
I see a hot tub as a giant petri dish: Human skin flakes and oils and small amounts of "wastes"
provide the food. The heater provides that nice warmth. Lots of moisture (obviously). Aeration for the oxygen loving critters. Lots of dark inaccesible tubes and pumps and ducts for the light-hating critters to raise a happy family. Something for every"thing", really. Chorine you add will evaporate out at the elevated temperature, unlike a swimming pool.