>>Pool filter sand? Never heard of that, honestly. As for walnut shells, its all a matter of opinion.

Actually it's not a matter of opinion, it's a matter of fact. You're absolutely correct in that all particulate substrates can cause impaction (or other troubles), and some are definitely worse than others. But dead animals aren't an opinion, they're a fact. I'm very glad you didn't have problems with your animal, but a lot of people have. Walnut shells are a poor choice among several better choices.
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Torey
Eugene, Oregon, USA
1.1 Saharan Uros (Joe and Arthur)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.1 Collared Lizard (Ripcord and Rorschach)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)

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