When used in conjunction with the standard Skimmer Net and Brush Panel, Matala Mat Kits create three-stage mechanical filtration that reduces maintenance and extends the time between Skimmer cleaning. For use with Skimmer with 14" Weir, 15000 GPH Skimmers. Top width of Skimmer Mat is 23.5" and bottom width is 22". Skimmer mats have a thickness of 1.5".