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Much of the water used in the US is used by people taking showers, since they use water constantly. Although water - saving devices like aerators can help, some people still spend 20 or 30 minutes taking showers. If a timer could be constructed into the regulator that starts making the water gradually
colder after 8 minutes or so, these people might be persuaded to take shorter showers... this would be most useful in places like hotels, where people must use what is offered.
||Why might it get progressively hotter? Maybe when someone was running a cold bath with the intent of selling your kidneys at $20k per?
||Oh absterge that kidney thing is just an urban legend. They go for more like $30k the pair and a smart organ dealer will throw in a pound of fresh liver to sweeten the deal.