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). Aquarium water changer can be used to remove water as well as add water 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. Be sure to add Aqueon Water Conditioner when adding clean water to aquarium. Developed by true aquatic hobbyists, Aqueon provides a broad array of aquarium solutions to help maintain healthy, life-sustaining aquatic environments.