A rectangular DE grid helps form the working filtration surface inside a compatible diatomaceous earth filter system, and this Filbur FC-9845 grid is designed in an 18 inch by 16-1/2 inch format with a center port for matching applications. When the original grid becomes torn, worn, or less effective, the filter can lose the dependable debris-capture support it should provide.The 18 inch by 16-1/2 inch dimensions, center-port layout, and FC-9845 reference give this part practical value because DE filter assemblies work best when the replacement matches the original size and internal port arrangement closely. A properly selected grid helps restore intended filtration support and contributes to cleaner routine maintenance.This type of part is especially useful when the larger filter structure remains serviceable and the issue is centered on a worn internal grid. That keeps the repair direct and efficient.Installed in the proper setup, this rectangular DE grid helps restore dependable filtration performance and contributes to cleaner overall system operation. Rectangular DE grid in an 18 inch by 16-1/2 inch format Center-port design supports intended internal alignment Helps restore dependable filtration-surface support Useful when original grids are worn or damaged Improves service confidence and filter quality