A mixing assembly for mixing settled solids in a liquid or the like, having a longitudinal axis, comprising: a mixing vessel comprising: a first upper wall that extends generally parallel to the longitudinal axis; a second upper wall that extends generally parallel to the longitudinal axis and opposes said first upper wall; a first lower wall that extends from said first upper wall that extends toward the longitudinal axis away from said first upper wall; a second lower wall that extends from said second upper wall that extends toward the longitudinal axis away from said second upper wall, wherein said first and second lower walls meet at an apex, and create a structure with a conical shape at its bottom; a directional tube, located at a central location within the mixing vessel, having a first end and a second end, at least a part of a contour of said second end substantially touching said first lower wall and said second lower wall, wherein said directional tube further comprises at least one slot located proximate to said second end wherein said at least one slot extends generally normal to the longitudinal axis; a first impeller disposed within said directional tube, connected to a rotatable shaft, said rotatable shaf actionable to impart a rotation of the first impeller in: i) a first direction to pump the liquid down the directional tube, and ii) a second direction to pump the liquid up the directional tube; and a second impeller connected to said rotatable shaft at a position exterior to the directional tube. a mixing vessel comprising: a first upper wall that extends generally parallel to the longitudinal axis; a second upper wall that extends generally parallel to the longitudinal axis and opposes said first upper wall; a first lower wall that extends from said first upper wall that extends toward the longitudinal axis away from said first upper wall; a second lower wall that extends from said second upper wall that extends toward the longitudinal axis away from said second upper wall, wherein said first and second lower walls meet at an apex, and create a structure with a conical shape at its bottom; a first upper wall that extends generally parallel to the longitudinal axis; a second upper wall that extends generally parallel to the longitudinal axis and opposes said first upper wall; a first lower wall that extends from said first upper wall that extends toward the longitudinal axis away from said first upper wall; a second lower wall that extends from said second upper wall that extends toward the longitudinal axis away from said second upper wall, wherein said first and second lower walls meet at an apex, and create a structure with a conical shape at its bottom; a directional tube, located at a central location within the mixing vessel, having a first end and a second end, at least a part of a contour of said second end substantially touching said first lower wall and said second lower wall, wherein said directional tube further comprises at least one slot located proximate to said second end wherein said at least one slot extends generally normal to the longitudinal axis; a first impeller disposed within said directional tube, connected to a rotatable shaft, said rotatable shaf actionable to impart a rotation of the first impeller in: i) a first direction to pump the liquid down the directional tube, and ii) a second direction to pump the liquid up the directional tube; and a second impeller connected to said rotatable shaft at a position exterior to the directional tube.