A pool cover system, comprising: a pool cover, a debris collection unit that is coupled to a front end of the pool cover; and a debris manipulator that is coupled to the debris collection unit and is arranged to move the debris collection unit between a debris collection position and a debris dumping position; wherein the pool cover system is characterized by at least one out of: (a) the pool cover system further comprises a sensor that is coupled to debris manipulator, wherein the debris manipulator is responsive to spatial information provided by the spatial sensor; (b) the debris manipulator comprises a contact element and a transmission system wherein the contact element is arranged to change a position upon contact with a pool sidewall that faces the front end of the pool cover and wherein the transmission system is arranged to convert the change of position of the contact element to a change in a position of the debris cleaning unit; and (c) the debris manipulator comprises a rod that has jagged surface; a gear and a gear axis; wherein the gear axis is connected to a debris collection unit; wherein the jagged surface of the rod meshes with the gear thereby translating a backward movement of the rod to a rotation of the debris collection unit about the gear axis. a pool cover, a debris collection unit that is coupled to a front end of the pool cover; and a debris manipulator that is coupled to the debris collection unit and is arranged to move the debris collection unit between a debris collection position and a debris dumping position; wherein the pool cover system is characterized by at least one out of: (a) the pool cover system further comprises a sensor that is coupled to debris manipulator, wherein the debris manipulator is responsive to spatial information provided by the spatial sensor; (b) the debris manipulator comprises a contact element and a transmission system wherein the contact element is arranged to change a position upon contact with a pool sidewall that faces the front end of the pool cover and wherein the transmission system is arranged to convert the change of position of the contact element to a change in a position of the debris cleaning unit; and (c) the debris manipulator comprises a rod that has jagged surface; a gear and a gear axis; wherein the gear axis is connected to a debris collection unit; wherein the jagged surface of the rod meshes with the gear thereby translating a backward movement of the rod to a rotation of the debris collection unit about the gear axis. (a) the pool cover system further comprises a sensor that is coupled to debris manipulator, wherein the debris manipulator is responsive to spatial information provided by the spatial sensor; (b) the debris manipulator comprises a contact element and a transmission system wherein the contact element is arranged to change a position upon contact with a pool sidewall that faces the front end of the pool cover and wherein the transmission system is arranged to convert the change of position of the contact element to a change in a position of the debris cleaning unit; and (c) the debris manipulator comprises a rod that has jagged surface; a gear and a gear axis; wherein the gear axis is connected to a debris collection unit; wherein the jagged surface of the rod meshes with the gear thereby translating a backward movement of the rod to a rotation of the debris collection unit about the gear axis.