I just finished 20 colonics in 30 days. Bought a package. My practitioner had a closed system which I loved. She stayed the whole time. Broke loose parasites and passed lots of gas/gallstones/gravel/sand/strawberry seeds/black pepper during process. my body had trouble releasing. just when my 30 minutes were up of in and out water she'd say we were done and half the time the next wash would release but then my time was up.... I felt better after each session. Good luck