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The water has to go someplace. You need a pump (money) that pushes it back into the system. The water heater will take the brunt of this. There it either puts the system under more pressure (not a good thing) or it pushes back past the meter (backflow prevention is a rare thing from my understanding) and you pay for it again when you turn the tap on.
You also increase the TDS of the input water, as well as add all that crap to the water tank (calcification).
Just my thoughts... I could be wrong.
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