An aeration nozzle for spraying water infused with air into an above-groundwater cavity definedby a wall comprises a nozzle body having at least a first internal conicalportion including anupstream end and a downstream end, the downstream end being smaller than theupstream end； awater way extending through the nozzle body and the first internal conicalportion； an air wayextending through the nozzle body, the air way intercepting the water waywithin the nozzle bodydownstream of the first internal conical portion, the air way including an airinlet in directcommunication with ambient air and a narrow suction hole downstream of the airinlet, whereinair is drawn into the air inlet of the air way without an air pump by a vacuumforce caused by waterflowing within the water way； and a support arm, having a first end coupled tothe nozzle body,and a free end that rests against the wall.
