The Blue Pearl is the best climbing, cleaning, and brushing robotic cleaner ever made. We install our patented PVA (poly vinyl alcohol) brushes on every machine. Originally designed to climb the slick tile walls of European pools, PVA brushes offer up to 100-percent greater traction, virtually clinging to the walls and providing unequaled gripping ability. It"s almost like having a scrubbing sponge for the pool. This special material lasts twice as long as conventional rubber brushes found on all other brands, and it resists oil, bacteria, algae and other contaminants. The Blue Pearl saves time and wear and tear on both the pool and cleaner itself. The Blue Pearl"s Smart cleaning pattern (which has made obsolete the ineffective zigzag and grid cleaning patterns other robotic cleaners follow) features a "One and Done", almost surgically precise, cleaning swath.