the device has an elongate net with an extended , open mouth . the net forms a channel - shaped volume in which floating debris from a swimming pool can be collected . a tubular frame member extends lengthwise across the mouth of the net , and floats are provided to support the net and the tubular frame member at the surface of the pool water , with the mouth of the net orientated to receive floating debris . in operation , the tubular frame member is connected to the return flow inlet of the swimming pool so as to receive a portion of the flow returning to the pool through the inlet . sprays on the tubular frame member are directed into the net . there is also an outlet for directing another portion of the return flow of water into the swimming pool so as to create a swirling flow of water in the pool which encourages floating debris to migrate about the pool to the net .