Fluid blending apparatus and methods are provided, the blending apparatus including components accommodating both passive and/or active mixing. The apparatus for performing the methods include a main body and closure connectable to define a chamber having a fluid outlet. A valved fluid inlet channel opens into the chamber and is tangentially oriented relative to a peripheral wall thereof so that fluid entering the chamber has a primary vortical flow circulation direction. A fluid injection channel opens to the inlet channel at an acute angle relative to direction of fluid flow through the inlet channel. A plurality of barriers is arrayed in the chamber to define interconnected inner and outer chamber portions. An impeller is rotatably mounted at the inner chamber portion and includes a plurality of blades oriented to urge flow from the inner chamber portion to the outer chamber portion.