@windstruck:

But whatever the enchantment pulled into it, it only had so much range. Perhaps far more range above ground, though there wasn't likely to be much of anything for it to find up here. It certainly was not going to pull anything out of a living creature.
This thought will probably keep nagging at Shandara for a bit. Just how certain is she that it wouldn't do that? The definition for what sewage was for the enchantment would be precise enough that it's unlike to take anything out of a living creature that the creature needs (it shouldn't cause any harm), but did she remember to include any other fail-safes to exclude the bowels of living creatures?