agreed, use only cold water for the ro filter. Every hot water tank has an anode of zinc in it to stop the corrosion of the glass lined steel tank. (glass lining is never 100%).
This zinc is the sacrifical anode, as in aluminum fish boats, or the lower leg of your outboard. Anyway, hot water then has zinc ions in it. Never cook with hot water, nor use hot water for the aquarium.
On a side note, if you replace the zinc anode every 5 yrs in your hot water tank, it will last a very long time.
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