I just replied to a new member intro thread with a similar question about sand vs. wood chips.
To me, it's a no brainer. Wood chips all the way!
With sand you have to scoop it to keep it clean. It adds dust to an already dusty environment. It doesn't decompose.
With wood chips, it provides a substrate the birds can scratch through, dust bathe in and it slowly decomposes along with the poop load.
In the over two years I've been running the current setup, I've never cleaned anything out, just add a truck load once a year and rake flat every few months.
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