Inclusion Criteria:  Scheduled for colonoscopy at the medical department at UNN Harstad Able to complete the positioning procedure during the enema  Exclusion Criteria:  Confirmed malignancy Inflammatory bowel disease Referral highly suspicious of cancer, inflammatory bowel disease or obstructive GI disease Contraindications for rectal catheter insertion (including known damage to pelvic floor, sphincter or the pudendal nerve) Use of anticoagulants. Use of acetylsalicylic acid is allowed Symptomatic cardiovascular or lung disease Kidney failure Known allergic reaction to any component in Liquid Polibar Plus Pregnant, lactating or planning pregnancy Asthma