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Does a bear Sh*t in the woods? lol. Sorry - my gpa used to say that to me all the time.
They don't smell when they run however the gunk it pulls out into the cup is real bad when you dump it. Hold your nose and turn away. I dump it down the old john.
What I mean is that when they are just running on your tank normally in the day collecting does the smell get out and can you smell it from the surrounding area?