The JBJ Instant Siphon is the all-in-one gravel cleaner that makes maintenance fun and simplified. This tool is so simple and easy to operate, you'll never need to purchase another gravel cleaner again. Our innovative siphon pump only requires a few squeezes to create a siphon from your aquarium. No need to drink "fish water" ever again. Dirty water, detritus, and gravel are vacuumed into the intake chamber, where the gravel is separated from the waste water and allowed to settle back to the aquarium. The waste is siphoned out without any mess and minimal disruptions to the natural setting of your aquarium. We have added a new safety feature so that there is no risk in accidently sucking up small fish during your cleaning; our new s trainer catches the critters before they take the plunge. Our rigid tube handle keeps the gravel cleaner stable and is a plus for deeper tanks. You also have the flexibility of adjusting the flow valve for faster flow rates, needed for larger aquariums and slower flow rates for smaller aquariums. If you prefer not to siphon out to a bucket, you can easily attach extra flexible tubing to the barbed outlet of the flow valve and siphon directly to a drain.