Unicel FS 3053 Rectangular DE Grid Replacement Swimming Pool Filters with Top Exit Port, Full Set Compatible with Sta Rite Tools Home Improvement POLARIS GENUINE PARTS: Made with funnels and spouts POLARIS GENUINE PARTS: Made with high quality materials and built to exact engineering specifications to ensure a long life with exceptional performance Low calories Suitable for in ground pools and above ground pools Grid Set: Full set is comprised of 13 grids: 3 FG 3916 and 2 each of FG 3011 which yield an optimal permeability to keep your water sparkling Optimal Performance: Grid cloth design allows for better DE caking properties and less resistance to water flow for optimal performance