JBJ Gravel Vacuum Cleaner + Auto Siphon Pump. **** PRODUCT MANUAL **** Making Water Changes Fun & Easy The Reason We Should Frequent water changes are a way of life for hobbyists worldwide to remove metabolic waste, particulate matter, and diluting nutrients in enclosed aquariums. Keeping a regular maintenance schedule ensures a healthy environment for fish, corals, and invertebrates while reducing the accumulation of nitrate. Replenishing with fresh & clean water is vital to restore trace minerals, buffering capacity, and maintaining tolerable nitrogenous levels. The Reason We Don't There are many annoyances associated with gravel vacuuming, such as getting the siphon started, spilling water, and stressing tank inhabitants. Instant siphon 2Making Life Easier The JBJ Instant Siphon in an 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 and water and allowed to settle back to the aquarium floor. The dirty water and waste is siphoned out without any mess and minimal disruptions to the natural setting of the aquarium. As a safety measure, we've integrated a gravel/fish strainer in case of accidents. Instant Siphon 3Our 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.