Aquascape® 29073 15″ x 19″ x 2″ Classic Series Standard And Large Pond Skimmer Filter Mat. This is a replacement filter mat for Classic Series Standard and Large Skimmer. The dimensions are 15″ x 19″ x 2″. When you choose an Aquascape water feature, you can rest assured knowing our work focuses on providing customers a natural, environmentally friendly approach to crafting and sustaining water features.