some people say that pine is not toxic, but i still dont use it, too similar to cedar. a lot of people use aspen, which is good because you can suck it up with a wet vac and it is very absorbent. but i find that it gets everywhere and is really annoying, so i use carefresh or its generic equivalent vibrasorb. can use a wet vac, but it clumps very well, holds a burrow, and is very absorbent and not too dusty.
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