An improved swimming pool cover system which incorporates a gap eliminator for use on pools which have walls of varying height and curvature, the gap eliminator secured to the wall by a cable and a plurality of anchors, the gap eliminator having a sleeve including a weighted buoyant material disposed below the pool cover attached to the cable and a second sleeve having buoyant weighted material disposed above the pool cover attached to the cable, thereby sealing the gap between the pool cover and the wall.