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Aaah; I understand now. You're correct they should just take your tanks and purge them at the dealership or give you new 'already purged' and filled ones.
No loss to them other than the price of the propane. The newer fill stations are required to have a recovery return to the main filling tank and it is this feature that allows them to perform purging without venting the contents to atmosphere so they wouldn't be out of pocket at all if done correctly.
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Sandra, Bruce
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