- Maintaining a healthy, happy aquarium doesn't have to be labor intensive with Lees® Ultimate Gravel Vac® the job just became easier. - The Ultimate GravelVac® attaches directly to most faucets and the 25' hose allows water to drain directly into the sink and refill is a breeze. - Attach it directly to most faucets. Use the faucet adapter if necessary. - Drain the dirty water right into the sink and refill the aquarium with ease. - No more need for heavy, messy, unwieldy buckets! - Water changes refresh your aquarium with precious nutrients and remove excess debris/fish waste, uneaten food and decomposed plant matter. - Twenty-five percent water changes should be performed at least once a month in order to maintain a healthy aquatic environment