This is a Pentair Purex SM-SMBW 2072 Filter Grid Element 72 Square Feet. It is designed for the SM-SMBW 2000 Series D.E. Filters Model 2072.
These grids are injection molded from 100% virgin, high impact styrene then covered with multi-filament polypropylene fabric. Each grid has been engineered with subtle design improvements specifically for this model and manufacturer.
