Here is the answer from another thread:
By Anonymous on Thursday, September 15, 2005 - 10:05 am:
Thanks for the quick reply... One more question: Is it better to use (for example) hay (or leaves or grass clippings) for the "biological sponge" and for cover in the compost bins OR is sawdust OK for those applications, too? I just purchased a pickup truck load for $10 and unloaded it in my center bin. However, it would probably not be too difficult for me to secure some old bales of hay for that purpose if it is clearly superior to the sawdust. I got the endloader man to dig the sawdust out from the bottom of the pile, so it is a partially decomposed, but not quite as far along as I would have preferred. Should be fine for the buckets, but I wasn't sure if using it, exclusively, in the compost bins would be a good idea. Thanks again!
By admin on Thursday, September 15, 2005 - 11:25 pm:
I would keep the sawdust to a minumum as cover material in the bins - better to use sawdust in the toilet and use a bulkier material in the bins. Some sawdust in the bins won't hurt, but it's probably a good idea to get in the habit of using hay, straw, weeds, leaves, wetc., in the bins as cover.
The above is from:
Mulched leaves work great, BTW, and are easy to secure this time of year.
All the best,