White, wax paper like residue in Moen cartridge

I have a strange thing happening. My tub faucet started leaking so I went to replace the cartridge as I have done a few times before. When I removed the Moen cartridge it had a bunch of pieces of little wax like paper stuck in different parts of the cartridge. I put in a new cartridge and it started leaking again a couple of days later. When I pulled out the new cartridge it also had this wax paper stuff clogging it up. Any ideas what this stuff is and how to get rid of it? Thanks.

 

Take one or more of your aerators from the faucets and see if you have the same stuff caught in there as well.