Colon Hydrotherapy Upper-east Side, in Manhattan. New York City Advanced Colon Hydrotherapy Center on upper-east side, in Manhattan. Colon Hydrotherapy is an effective method for cleansing the large intestine. It is safe and painless, clean and relaxing procedure. A soothing flow of filtered water, gently removes digested toxins and waist that built-up inside the colon. in Public bookmarkswith system:unfiledby 3 users