I can tell you my experience with black 'ropes'...I had one a foot and a half long and one 2 feet long! I am NOT kidding. Looked just like those crazy-icky pictures in the Picture Gallery . yuk.
I did a 9 day Master-Cleanse taking Bentonite and psyllium shakes 4 times daily. Drinking lots and lots of water as well as my lemonade. I didn't do the salt water flush. I took a laxative herbal tea every night. (not recommended for more than, say, a week at a time, though. On my 2nd fast/cleanse I only took the herbal laxative tea every other night) I got my big ropes out near the beginning...wide and long! yoiks.
On Day9 I had my first great, liver flush. Then I continued with more b&p shakes 3times a day...while I just ate normally. I got more ropes out, but not big anymore. They looked like they were coming from different parts of my intestines. Some 'lobe-like' others twisted and ropey/frond like....very very odd, I tell you! (during that first MC/cleanse I did get out different, smaller-shaped mucoid plaque as well)