I wanted to bring a water filter one time. TSA saw a capped pipe (PVC with PVC end caps) with suspicous material inside (carbon block filter material). Turned out I knew one of the TSA agents, my town is small. So it wasn't immediate "off to the hoosgow". Once they saw what it looked like, and what it was they let me continue. And when I got to my hotel, the dang thing didn't fit on the bathroom water filter, so I never used it anyway.
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