What is a weir flap and is it required?
The weir flap is a doorway into the skimmer. It has two functions: 1). When the pump is on and the water is moving, the motion action of the weir helps draw debris into the skimmer. 2). When the pump is off, the weir prevents the debris from floating out of the skimmer into pool. Yes, a weir flap is required in order to maximize the surface cleaning of the skimmer and hold in debris. Missing weir flaps must be replaced.
