Key Features Replacement Media Foams Suitable for Super Fish Aqua Flow XL Easy to install It is recommended to replace media regular to ensure clean and healthy water 9 x 5 x 3cm per foam. Pack of 2 SuperFish AquaFlow replacement media has all you need to replace or upgrade your aquarium filter These easy to click in cartridges are a simple straight replacement for the existing Dual Action cartridge in your AquaFlow filters. The cartridges contain a filter a filter foam that also includes activated carbon that absorbs toxic substances from water (Will not fit the AquaFlow XL)