A Multi-centre Study Comparing the Polyp Detection Rate of Two Different Types of Bowel Preparation: a 2-litre Solution (MOVIPREP®) Versus a Hyperosmotic and Stimulant Combined Low Volume Bowel Preparation (Sodium Picosulfate and Magnesium Citrate)

Inclusion Criteria: * Patient's written informed consent must be obtained prior to inclusion. * Male or female outpatients or inpatients aged 40 to 80 years with an indication for complete colonoscopy. * Willing to undergo a colonoscopy for diagnostic or surveillance purposes * Patients with a known personal of familial risk of colon neoplasia, willing to undergo a screening colonoscopy * Willing, able and competent to complete the entire procedure and to comply with study instructions. * Females of childbearing potential must employ an adequate method of contraception. Exclusion Criteria: * History of gastric emptying disorders. * History of ileus, toxic megacolon, gastrointestinal obstruction and colonic perforation. * History of phenylketonuria. * Known glucose-6-phosphate dehydrogenase deficiency. * Known hypersensitivity to macrogol 3350, sodium sulphate or ascorbic acid/sodium ascorbate. * History of colonic resection. * Requirement for permanent medication and associated stable serum concentrations (e.g. neuroleptic drugs). * Presence of congestive heart failure (NYHA III + IV). * Acute life-threatening cardiovascular disease. * Documented history of severe renal insufficiency (creatinine clearance \<30 ml/min). * Other contraindication described in the summary of product characteristics (SmPC) of either preparation. * Patient has a condition, clinically significant laboratory results, or is in a situation which, in the investigator's opinion, may put the patient at significant risk, may confound the study results, or may interfere significantly. * Application of any unlicensed medication within the previous 3 months or participation in any other research study in the last 3 months. * Females who are pregnant, nursing or planning a pregnancy. * Patients who, in the opinion of the investigator, may not be compliant with the study requirements. * Previous participation in this clinical study.