iRobot Verro 500 PowerScrub Pool-Cleaning Robot for In-Ground Pools Hands-free pool-cleaning robot for in-ground pools up to 20 by 50 feet Systematically cleans from floor to waterline in about 3 hours PVA roller brushes "power scrub" all pool surfaces; auto-reverse function Reusable fine filter bag removes large and small debris down to 2 microns Measures 19 by 15-2/3 by 14-3/5 inches; 1-year warranty