The water diverter directs the water at the spillway edges along the diverter and folds the water inward towards the center of the spillway forming a bead of water at the edges of the spillway. The edge water beads have higher water volume which results in faster, more forceful water flow down to the pool surface, so wind breezes can not create overspray on the sides of the pool waterfall face. Dried water overspray from the spa or negative edge waterfall spillway causes the ugly white calcium buildup on the pool waterfall face and on the sides of the negative edge reservoir. Science and technology really does work!