When i used the bag stuffed i used this stuff check the link, i am sure that tis company is not contributing to the contamination of there product. The other companies i really don't know. But i researched and this company was the best. They do a lot in the way of ensuring there production practisis are sanitary. I however have switched to blank newspaper sheets, are they 100 percent sanitary no, but i feel better about the odds if this product vs old newspaper. http://old.harlan.com/about_harlan_laboratories