while most of us have an inline or whole house water filter that tank water is going to pass thru when you fill it, the water sitting there in your tank for long periods is not going to 'go bad', as there's nothing to make it go bad...
but, also, unless you are drinking your 'old' water tank water straight, it's really a none issue - most any of us are only using it in the shower, the kitchen sink, or if used in the coffee maker, it's being heated enough to not be any issue anyway.
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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