A device for gathering debris floating at or near the surface of a swimming pool, the device having a spray head assembly releasably installable in front of an in-wall skimmer on a side of the swimming pool, the spray head assembly comprising a connector through which a pressurized flow of water is receivable from an external source; an inlet duct assembly pivotably connected to the spray head assembly; and an elongate debris collection bag releasably attachable to the inlet duct assembly, the collection bag extending into the pool at or near the water surface and substantially perpendicular to that portion of the pool wall adjacent to the spray head assembly, and having at least one water outlet disposed distally from the inlet duct assembly.