I do hope you are doing colonics with a therapist.
Anyway, I really don't know much about colonics, so I am giving you to links that, hopefully, answer your questions.
https://www.optimalhealthnetwork.com/Colonic-FAQs-s/232.htm#HowOften
https://detox.net.au/colon-cleanse/black-ropes-coming-out-mucoid-plaque/
My Best,
Luella