Moe Speaks: A Mystery

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About once a week I get to take a shower.  Mom soaps me up with Neem shampoo (which has really helped with my itchies, thanks for the recommendation Bogart!), lets me putter for a few minutes while the 'poo soaks in, then rinses me off.
In all that time, however, I've never been able to figure out--just what happens to the water that goes down the drain?  Where does it go?  And, more importantly, how can I follow it?