Yes. Since they are not self administered but conducted by an ARCH therapist they have a proven record of safety and are effective. The filtered water is administered at low pressure so there is no danger of bowel perforation. All equipment used is either disposable or sterilised using hospital-approved sterilants or regularly serviced autoclaves.
I am trained to ARCH standards having undergone practical application training along with practical and written exams. The colonic schools that teach to ARCH standards are independently audited. ARCH members are required to undergo continuing professional development and keep up to date with relevant legislation.
Furthermore, from 2010, all ARCH therapists are independently regulated by the government recognised CNHC (Complementary & Natural Healthcare Council) to give you further confidence.