If you have good clean tanks, it's much better to have them refilled than to exchange. I have 2 that I know are "clean" and will not exchange them until their life expectancy has expired (12years).
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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