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safe to leave top off water sitting around?

820 Views 3 Replies 3 Participants Last post by  riva
is it safe to fill and decontaminate/dechlor 5 gallons of water in a 5g tub and then top-off with that throughout the week as needed?
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the only thing i think would change would be the pH right?
The dissolved solids aren't evaporating so the water does change a bit when you top off. Over a week it shouldn't matter.
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