 The purpose of the protocol is to demonstrate that EziclenIzinova, an osmotic sulphate-based laxative preparation given on the day before colonoscopy has non-inferior efficacy to Klean-Prep polyethylene glycol PEG-electrolytes on colon cleansing in adolescents aged 12 to 17 years inclusive with a body weight 40 kg, scheduled to undergo a colonoscopy for a routinely accepted diagnostic indication. 