iRobot 300 - Manual (Page 11)

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How Verro Works
iRobot Verro uses a powerful motor to draw 80 gallons of water per minute
through the filter bag. This creates strong suction at two inlet ports under the
robot that draws dirt and debris, such as bacteria, algae, leaves, and even
coins into the filter bag where they are trapped.
The pump motor also drives two high-pressure jets under the robot that
loosen dirt and attached particles, which are then vacuumed up.
Verro uses the force of the water being pumped through the robot to hold
itself against the surface it is cleaning and to move along it.
Each time it changes direction, Verro automatically alters it course slightly so
that it covers the entire bottom and sides of the pool efficiently.