The iRobot can clean your pool from floor to waterline in about an hour with the touch of a button. Apparently, roller brushes scrub pool surfaces while a powerful vacuum and self-contained filtration system pick up and trap dirt and debris plus algae, bacteria and debris as small as 2 microns. It even reduces run time of your pool's filtration system and improves distribution of chemicals and temperature. It costs $1199.99.
I live in San Francisco, where only 1 in 100,000 people has a pool and most of us get our splash time out of the area or at a spa.