I breed my own rats in a rack I built(it was easy) and use large concrete mixing tubs to keep them in. I buy this stuff called Equine Pine at the feed store and put a layer of it on the bottom of the tub with pine shavings over top. That lasts for about a week and a half or so before it starts stinking. Here's the website where I got the plans for the rack:

http://www.rodentracks.com/Large-Tub-Rat-Rack.html

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