The effects of depressurization on internal structures is not intuitively obvious to non-engineers, but a 20 foot wide by 20 foot high wall that sees a 1.2 psi rapid pressure decrease feels a load of about 70, 000 lbs of horizontalforce.
It measures force to determine 3-dimensional position, such as deep, shallow, horizontal or vertical, and adapts the pool cleaner for maximum cleaning action.