Mechanical bowel preparation in laparoscopic colorectal surgery

Interventions: (A) arm Moviprep
1) Take Moviprep at 1 L/hour orally
2) Take 0.5L of water after intake of 1L of Moviprep (Stop taking Moviprep if feces become clear)
3) In case of unclear feces after intake of 1L of Moviprep, continue to take Moviprep and water until clear feces evacuation
4) Maximum dose of Moviprep is 2 L
(B) arm Niflec
1) Take Niflec at 1 L/hour orally
2) Stop taking Niflec if feces become clear
3) Maximum dose of Niflec is 2 L
Primary outcome(s): Availability of bowel irrigation effect
Study Design: randomized controlled trial, single blind, active control, parallel assignment, treatment purpose