A laundry washing machine having a washing basket that is loaded through the upper area, and an agitator located inside the washing basket. The agitator has a base, a hollow elongated body provided with at least one opening, and a filtration element located within the agitator. The agitator has a plane defined by the intersection of at least two areas of the edge of the opening to form an angle, relative to a tangential velocity vector of the rotational movement of the agitator starting from said opening, the angle being defined between 15° and 90°.