Are filters like this supposed to disintegrate then (genuine question)? More likely down to an incorrectly manufactured kit than poor maintenance, if not. Send an email anyway, the worst they can say is no!
I have no idea to be honest but I know its RAMAIR that make the filters for them.
Like I say mine on my 182 has done exactly the same and I will be buying a new one to replace it (Around £46 I think)