Maintaining a healthy, happy aquarium doesn't have to be labor intensive with Lee's Ultimate GravelVac the job just became easier. The Ultimate GravelVac attaches directly to most faucets and the 50' 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