I have heard that old TP rolls and egg cartons are ok too. Is there any truth to that? I have never had a rat chew through a tub yet but I would love to know all kinds of ways to keep it that way!
And regarding Vasiliki's post: if you have a gravitational(?) water system there is a possibility that the tube has become clogged somehow. I have heard of this happening on one or two occasions but I would imagine it is pretty rare.
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