Replacement Whisper EX Filter Cartridges offer the modern touch on power filter filtration. A new, round, modern design offers a hands-clean, pinch-open cartridge design that keeps your hands away from messy carbon. Improved flow rates through maximize filter performance, while enhanced biological filtration provides the superior filtration you require. Choose medium or large size depending on your Whisper Filter. Large size is designed for Whisper Ex30, Ex45 and Ex70 power filters.