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The **Unicel FS 1004** Swimming Pool Vertical D.R. Filter Grid is for up flow and down flow D.E. Filter systems, i.e. American, Astral, Hayward, Jandy, Pac Fab, Premier Atlas, Purex, Sta Rite, and Waterway. *Unicel* is the nation's leading manufacturer of swimming pool filter replacement cartridges. They are made from heavy duty polyester and are designed to last far longer than cheaper alternatives. *Unicel* filters are made in the USA for the highest possible quality, allowing you to buy with confidence. 1 Buy = 8 Grids!