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I drain mine thoroughly, hang/suspend it with the open end down, and stick an empty paper towel tube stuffed with paper towels into it to keep it open. I've found that if I only use water, and let them air dry promptly, I never have a problem. I only use filtered water in my bladder. If I feel I want to clean them, I use a warm white vinegar water solution ...


take a fish tank pump or air mattress pump and run a plastic tube into the bladder. It circulates air and takes about 30 minutes. For the tube itself, I remove the bit valve off the end and swing it around to get the centrifugal force to get most of the water out--then I use the pump--takes about 5 minutes.

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