Abstract: A debris collecting device for a swimming pool skimmer includes a floating elongated dam insertable in a dam holder. The dam holder is inserted into the skimmer's cavity of a swimming pool, having a through-the-wall skimmer opening, for a filter pump. The location of the floating dam increases the efficiency of the pool pump skimming function, by catching and directing floating debris on the pool's surface in its reach thru the skimmer's opening, into the filter pump, therefore cutting running time of the pump, saving energy and cost for pool owners. The holder itself is adjustable for most sizes of through-the-wall skimmer/filter inlet cavities. A readily available broomstick screwed into holder acts as the floating dam, reaching into the pool at a slight angle projecting toward the flow of water. An optional directional water return outlet is provided, to increase the effect of the floating dam.