I agree, it's a breakdown of the pre-shredded cheese, not filler. The pre-shedded starts to dry out a bit and thru handling, pieces start to break up. I get the 5# chunks of Stella from Sam's and shred or dice myself, I find it's a better quality that way and holds up to freezing 'much' better. Shredded doesn't do as well freezing and thawing or freezing for longer periods. All and all, Stelle's a very good cheese, but like any cheese, whole chunks are always better than pre-shredded, but in high volume operations the pre-done stuff is more convenient.