Abstract: A pool cleaning robot that includes a ballast tank for controlling a buoyancy of the submarine pool cleaner; at least one cleaning element for cleaning debris from an underwater surface of a pool while the pool cleaning robot hovers over the underwater surface; a propulsion module that is configured to propel the submersible pool cleaner; and a steering module that comprises a rudder and diving planes.

Abstract: A pool cleaning robot that includes a ballast tank for controlling a buoyancy of the submarine pool cleaner; at least one cleaning element for cleaning debris from an underwater surface of a pool while the pool cleaning robot hovers over the underwater surface; a propulsion module that is configured to propel the submersible pool cleaner; and a steering module that comprises a rudder and diving planes.

Abstract: A pool cleaning robot that includes a ballast tank for controlling a buoyancy of the submarine pool cleaner; at least one cleaning element for cleaning debris from an underwater surface of a pool while the pool cleaning robot hovers over the underwater surface; a propulsion module that is configured to propel the submersible pool cleaner; and a steering module that comprises a rudder and diving planes.

Abstract: A pool cleaning robot that includes a ballast tank for controlling a buoyancy of the submarine pool cleaner; at least one cleaning element for cleaning debris from an underwater surface of a pool while the pool cleaning robot hovers over the underwater surface; a propulsion module that is configured to propel the submersible pool cleaner; and a steering module that comprises a rudder and diving planes.

Abstract: A method for charging and an underwater station that may include a platform and a first contactless charging element for charging a pool cleaning robot mounted on the platform; wherein when the underwater station is positioned in a pool the first contactless charging element is spaced apart from the bottom and sidewalls of the pool.

Abstract: A kit that may include an interfacing device that includes pool sidewall interface, and a pool cleaning robot that includes a housing and a drive system. The drive system may include a drive motor system, a group of interfacing modules and a transmission system that is arranged to mechanically couple the drive motor system to the group of interfacing modules. At least one interfacing module of the group may include protuberances that are shaped to fit a non-smooth surface of the pool sidewall interface.

Abstract: A kit that may include an interfacing device that includes pool sidewall interface, and a pool cleaning robot that includes a housing and a drive system. The drive system may include a drive motor system, a group of interfacing modules and a transmission system that is arranged to mechanically couple the drive motor system to the group of interfacing modules. At least one interfacing module of the group may include protuberances that are shaped to fit a non-smooth surface of the pool sidewall interface.

Abstract: A pool cleaning robot that may include first and second fluid openings, with a fluid path between the first fluid opening and the second fluid opening; a turbine at least partially disposed within the fluid path so as to extract energy from flow of fluid through the fluid path; an electrical generator; a rechargeable power source; and a controller that is arranged to direct the pool cleaning robot to be positioned in a certain location in which a flow level of fluid that is circulated by a pool fluid circulation system is higher than a flow level of the fluid within a majority of the pool, wherein when positioned at the certain location the fluid that is circulated by the pool fluid circulation system passes through the fluid path.

Abstract: A system for maintaining a pool cleaning robot, the system may include a cover, a cleaning unit that is positioned within a space and a cover manipulator, wherein the cover manipulator is configured to move the cover between a first position in which the cover prevents the pool cleaning robot from entering the space and a second position in which the cover defines an opening through which the pool cleaning robot passes to enter the space.

Abstract: An underwater station may include a filter manipulator that is arranged to input a filter into a pool cleaning robot that is located in a filter replacement position and to assist in positioning the filter at a filtering position in which the filter is at least partially disposed within a fluid path formed between a first fluid opening and a second fluid opening of the housing thereby allowing the filter to apply a filtering operation on fluid that passes through the fluid path.

Abstract: A pool cleaning robot that includes a ballast tank for controlling a buoyancy of the submarine pool cleaner; at least one cleaning element for cleaning debris from an underwater surface of a pool while the pool cleaning robot hovers over the underwater surface; a propulsion module that is configured to propel the submersible pool cleaner; and a steering module that comprises a rudder and diving planes.

Abstract: A pool cleaning robot that may include first and second fluid openings, with a fluid path between the first fluid opening and the second fluid opening; a turbine at least partially disposed within the fluid path so as to extract energy from flow of fluid through the fluid path; an electrical generator; a rechargeable power source; and a controller that is arranged to direct the pool cleaning robot to be positioned in a certain location in which a flow level of fluid that is circulated by a pool fluid circulation system is higher than a flow level of the fluid within a majority of the pool, wherein when positioned at the certain location the fluid that is circulated by the pool fluid circulation system passes through the fluid path.

Abstract: An underwater station may include a filter manipulator that is arranged to input a filter into a pool cleaning robot that is located in a filter replacement position and to assist in positioning the filter at a filtering position in which the filter is at least partially disposed within a fluid path formed between a first fluid opening and a second fluid opening of the housing thereby allowing the filter to apply a filtering operation on fluid that passes through the fluid path.