The Aqueon Aquarium Water Changers are designed to help eliminate the potential for messy aquarium spills and transporting heavy buckets of water. Simply attach the water flow assembly to the faucet using the included multi-connection faucet adapter and turn on the faucet (see diagram for faucet types compatible with Water Changers). Aquarium Water Changer can be used to remove water that will go right down the drain as well as add water right back into aquarium. It makes routine water changes easier and also vacuums out the debris in the gravel. By adjusting the flow direction, clean water can easily be added back to the aquarium after removing the dirty water. Be sure to add Aqueon Water Conditioner when adding clean water to aquarium. Available in different sizes to accommodate different aquariums needs. Developed by true aquatic hobbyists, Aqueon provides a broad array of aquarium solutions to help maintain healthy, life-sustaining aquatic environments.