The type of debris your pool typically collects is another vital factor in choosing the right robot.
If your pool is surrounded by trees, leaves, twigs, and other large debris may be common, necessitating a robot with a high-capacity filter basket and powerful suction. The research by the NSPF suggested that pool cleaning robots with a power of at least 1,200 gallons per hour in suction power will be helpful in managing larger debris.
With its fine mesh filter and special scrubbing system, robots are an ideal way to clean large amounts of fine debris such as sand, dirt, and pollen. The algae buildup, common in most warm, humid climates, would require robots that can climb walls, in addition to the rotating brushes designed to dislodge biofilm from pool walls and water lines.
More than anything, finding a pool-cleaning robot will probably start with understanding the special needs of your particular pool. Matching the capability of the robot with your specific-sized pool, the shape, and surface material of your pool, along with what kind of general debris is trapped, will ensure a cleaner pool besides extending the life of the pool and the robotic cleaner.