Maintenance is a necessary part of a good aquarium keeping. Routine water changes and pulling debris from gravel helps maintain a natural balance in the aquarium environment. Aqueon Siphon Vacuum Gravel Cleaners help to make this job easier and take less time. Just a simple up and down motion with the intake tube will quickly prime the siphon to begin water flow. Convenient priming bulb included for alternative method to start water flow. Debris is pulled away with flowing water and disposed of while gravel falls to the bottom of the aquarium. Be sure to add Aqueon Water Conditioner when adding clean water to aquarium. Five different siphon gravel vacuum sizes to accommodate different aquariums.