The Dolphin S 50 absolutely sets the standards for above ground robotic pool cleaners. It cleans pool floor and coves and is recommended for above-ground residential pools up to 40 ft. in length. The active brush spins 2x times faster for more scrubbing power. It will scrub and vacuum the pool in just 1.5 hours. The Top access canister is easy to clean. The S50 is incredibly efficient and costs less than 15 cents to clean the pool! The S50 is self programming, plug-n-play and in-store repairable at A-1 Pools!