A filter for an aquarium is like a cleaner in a house. It takes out dirt from the water. Ones in a while the filter is cleaned by taking the dirt it has accumulated over time and fixed back in the aquarium. Every aquarium should be clean over time but with a filter installed the frequency of cleaning is reduced because of the filter dose the cleaning for you for long. Fixing the filter to the aquarium is very easy. It has a sucker rubber that sticks to the glass. The filter sponge absorbs dirt and clears the water Fully submersible and ideal for any aquarium filtration Product Dimensions: 11 x 5 x 30 cm Type: Power Suitable Water Volume: 2000 L Filtering Area: 100 sq. cm Filter Circulation: 1200 L/hr