There's a Rite-Size Cartridge for every Penguin Filter as well other filters.

And for the Emperor Filter Systems, our heavy duty Emperor Filter Cartridge delivers two full ounces of activated carbon filtration and 45% more mechanical filter area.

Each pre-assembled Rite-Size and Emperor Cartridge has a patented ribbed back that evenly distributes carbon for maximum water to carbon contact...no bypass, no "tea bag" effect.

Features:
• Larger Polyfiber Filter Pad-traps more dirt...faster.
• Up to 100% More Carbon.
• Ready-To-Use Convenience.