The Dennerle Nano Filter Extension is designed to enhance the functionality of both the Dennerle Nano Corner Filter and Nano XL Corner Filter. This innovative extension increases the filter's capacity by an additional 60ml, providing more space for filter media such as activated carbon or phosphate binders. It attaches effortlessly via a clip-on design that allows for easy installation and removal, ensuring you can switch out materials quickly without compromising water flow. The extension is ideal for maintaining optimal aquarium conditions in small to medium-sized saltwater setups.