Abstract: A water aeration diffuser has a base with an internal cavity defining an air pocket, and a ceramic plate removably attached to the base. The base is in flow communication with air supply such that air is received in the cavity and then diffused by the ceramic plate to create an aeration column in a body of water. To allow for repair and servicing, the ceramic plate is removably attached to the base by one or more fasteners. The base includes a perimeter lip around its top portion that supports the ceramic plate and maximizes the exposed surface area of the plate. A water and air-tight gasket is provided between the lip and the ceramic plate. An eye-bolt may be provided through the ceramic plate and attached to the base to provide an attachment point for a ballast or other means used to position the diffuser.