[Sproket]

I honestly ahve been having a little problem with my Whitewater collecting fuzz, lint at the input barb. I have no idea where this lint is coming from. I take system apart and clean everything and fill outside of case and distilled water is crystal clear, lint free when I add it. I must be missing something.
Right now I think Im lint free, if temps start to rise after weeks then I know I have lint.
Now Im using a new rad so this problem maybe solved.
Before was a dtek heatercore. Now Aquacoil II.
Maybe I had lint inside of dtek rad?