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. Suitable for both fresh and salt water. Super Quiet, efficient energy economising, easy to clean. Model: WP-2000F, Volts: 220-240V, Frequency: 50/60Hz, Power: 20W,