“Cleansing the intestines” is not a medical concept; gut health is primarily supported by fiber intake, hydration, and movement. Mineral water—especially magnesium-containing types—may support bowel motility and ease constipation in some people. However, this is not a detox or cleansing mechanism; it is a functional support for motility. If constipation is persistent or accompanied by bleeding, weight loss, or severe pain, seek clinical evaluation rather than relying on mineral water.