Abstract: A multi-layered flexible sparger (100) that has a bottom film layer (102), a middle film layer (106), and a top film layer (110); a first inner mesh (104) disposed between the bottom film layer and the middle film layer: a second inner mesh (114) disposed between the middle film layer and the top film layer; and a port capable of delivering a gas to the multi-layered flexible sparger disposed between the top film layer and the bottom film layer, wherein the middle film layer includes drill holes and the top film layer includes drill holes.

Abstract: A hollow shaft impeller (100) having a hollow impeller housing (120), a magnet (108), an impeller cap (102), an impeller retainer (106), and a plurality of impeller blades (134). The impeller housing has a hub (130) that defines an interior volume (128) and an impeller bore that provides access to the interior volume. The magnet may be sized to be disposed within the interior volume. The impeller cap may be removably coupled to the hollow impeller housing proximate to the impeller bore. The impeller retainer may be removably coupled to the magnet and sized to be disposed within the interior volume. The plurality of impeller blades may project from the hub. Optionally, fins (140) may be disposed on each of the plurality of impeller blades.

Abstract: A multi-layered flexible sparger (100) that has a bottom film layer (102), a middle film layer (106), and a top film layer (110); a first inner mesh (104) disposed between the bottom film layer and the middle film layer; a second inner mesh (114) disposed between the middle film layer and the top film layer; and a port capable of delivering a gas to the multi-layered flexible sparger disposed between the top film layer and the bottom film layer, wherein the middle film layer comprises drill holes and the top film layer comprises drill holes.