An aerator having a rotatable shaft that is secured to a magnetic driving element and a plurality of plates positioned in spaced apart relation to the magnetic driving element. Each plate and the magnetic driving element have a plurality of elongated openings about their peripheries to enhance aerodynamics and thus oxygen content within the aerated water. Simultaneously because of the rotation of the magnetic driving element a magnetic field is created in the water providing optimum conditions for the growth of algae and biofloc within the water.