The Hayward replacement filter cartridge is designed for compatible C100S filter applications where the internal cartridge element needs replacement. A filter cartridge is useful because it captures dirt and debris as water passes through, helping maintain cleaner water and supporting dependable filtration performance.This replacement is especially useful when the original cartridge is torn, clogged beyond cleaning, collapsed, or no longer filtering effectively. Replacing the cartridge can help restore water clarity and more dependable circulation support.The CX100XRE is a practical service part when a compatible Hayward C100S filter needs a cartridge to restore dependable filtration performance. Hayward replacement filter cartridge Fits compatible C100S filter applications Helps trap dirt and debris for cleaner water Useful when the original cartridge is worn or clogged Supports cleaner and more dependable filter performance