The Hayward Pro-Grid assembly is designed for compatible DE4820 DE filter applications where the internal grid assembly needs replacement. A grid assembly is useful because it provides the internal structure that supports DE media and helps remove fine debris from circulating water.This replacement is especially useful when the original grid assembly is torn, damaged, clogged beyond cleaning, or no longer filtering effectively. Replacing the internal assembly can help restore dependable filtration performance without replacing the full filter housing.The DEX4800DC is a practical service part when a compatible Hayward DE4820 filter needs a Pro-Grid assembly to restore dependable filtration. Hayward DE4820 Pro-Grid assembly Designed for compatible DE filter applications Helps restore internal DE filtration support Useful when the original grid assembly is damaged or worn Supports cleaner and more dependable filter performance