Easy to Use: Simply insert the Gravel Vacuum for Aquarium filter into the aquarium and gently press the pump. Clean stains by inserting the filter into the gravel and pressing the pump to create a siphon, then lifting it slightly so as not to remove the gravel from the aquarium. No-Mess Shut-Off Value: Our aquarium vacuum has a shut-off valve that ensures water does not spill onto the floor after cleaning is complete. The aquarium siphon pump can be used around carpet without worrying about spilling water. Built-in Gravel/Fish Filter: Easy to adjust the flow rate so gravel and sand stay in the tank and are not siphoned out. Convenient: You can easily remove it in pieces and clean it. Instructions 1. Place the water changer in the aquarium. 2. Place the water outlet at the other end of the water hose in the bucket. 3. Open the regulating valve. 4. Gently squeeze the air cavity with your hand until it automatically discharges water. 5. Lower the water inlet to suck the fish manure and feed residues into the sand. Product advantages: Add air cavity, higher performance: add air cavity, higher performance, large water flow, higher efficiency. Product material: environmentally friendly soft rubber tube (hard tube). The water outlet valve is adjustable: the water outlet valve can adjust the water flow size according to the left and right. High-quality hose lengthened by 1.35 meters: high-quality hose outer diameter 18mm, lengthened by 1.35 meters, environmental protection hose, long service life. Product length: the total length is about 2.5 meters. Product weight: about 420g (excluding packaging) Product features: built-in filter grid, lightly squeezed water immediately Size: the total length is about 2.5 meters, with extended hose. Product color: blue Delivery quantity: 1 piece becomeveryrich