A pool cleaning device is provided, including: a main body; a rotating unit rotatably disposed on the main body, the rotating unit including a rotating member, a fluid outlet extending radially outward from the rotating member, and a first positioning protrusion extending radially outward from the rotating member and spaced apart from the fluid outlet; and a reversing member including a plurality of stoppers spaced apart from each other and disposed along a path of rotation of the rotating member. Each of the plurality of stoppers is reciprocable between a position in a path of rotation of the first positioning protrusion and a position out of the path of rotation of the first positioning protrusion.

A pool cleaning device is provided, including: a main body; a rotating unit rotatably disposed on the main body, the rotating unit including a rotating member, a fluid outlet extending radially outward from the rotating member, and a first positioning protrusion extending radially outward from the rotating member and spaced apart from the fluid outlet; and a reversing member including a plurality of stoppers spaced apart from each other and disposed along a path of rotation of the rotating member. Each of the plurality of stoppers is reciprocable between a position in a path of rotation of the first positioning protrusion and a position out of the path of rotation of the first positioning protrusion.

The present invention provides an apparatus, method and system for utilizing commercial cargo containers. The present invention utilizes containers made autonomous by coupling a container with a detachable propulsion system, having a motor and navigation and steering controls, permitting the rapid, controlled, efficient and safe delivery of cargo containers individually by water. Ballast units, deployment systems and control via remote units are also disclosed. The containers, utilizing their inherent buoyancy, can move autonomously according to a preplanned or remote controlled route to a specific location.