An aerator mixing rod includes a body having a first end, a second end opposite the first end, an outer surface, and a plurality of teeth extending radially outward from the outer surface. The teeth include a first row of teeth and a second row of teeth spaced from the first row of teeth along a longitudinal axis of the body. A first passageway is formed between adjacent teeth of the first row of teeth, and a second passageway is formed between adjacent teeth of the second row of teeth. The first passageway is at least partially misaligned with the second passageway in a direction parallel to the longitudinal axis to at least partially form a tortuous path for fluid flowing along the outer surface of the body. The aerator mixing rod is formed from an injection-moldable material by an injection molding process.