Could be that you are just clearing out old junk from your colon. parasites can create a filmy residue, and if you were constipated, it just stayed there and rotted, forming to your colon.
I read your past posts, you didn't mention the possibility of parasites, but it is common people are unaware they have them. I sure was. In my case it was intestinal worms, which can create so many symptoms, including food intolerances , constipation, etc. The long white rubbery strings, could they have been worms?
I am wondering just what all you are doing/taking internally to get such great cleansing, and most importantly, are you feeling any better getting all this stuff out?