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8. Not So Clean Water

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It is recommended not to drink water from lavatory tap on airplanes (for good reasons, of course). But what about the potable water which is used in tea and coffee. Many flight attendants do recommend sticking to bottled beverages and not drinking coffee or tea on the plane. The tanks for the drinks are clean, but still there are doubts over how often they are cleaned. But we cannot ignore that the valve for filling clean water is quite close to the one for cleaning lavatory waste.