Connect the cylinder with hose with the connection part. Rotate the flow adjuster in a counter clockwise direction. Put the discharge hose to a container lower than the surface of the water. Submerge cylinder into the water and and down to start. When the water starts flowing, control the water flow with the flow adjuster as needed. Move the cylinder to another place to keep cleaning when the water become clear. Please note that if it stucks, clean the strainer and put the discharge hose downwards inside the container. Features - - Material: Plastic. - Size: Approx. 36.4 * 16.8 * 4.6cm/ 14.3 * 6.6 * 2.7 inch (L*W*H). - Made of durable plastic, beautiful design, compact structure, easy to use. - Strong suction and large flow. Sand washing cylinder allow you to take the waste in sand along with water easily. volume 1.76 gallon (8L)/ min. For fish tank 50-100 gallon. - Controlling the water flow as needed with water Adjuster freely and easily. - Unique pressure design allow you to simply shake the cylinder to the to start transferring water without effort (Squeeze Free). - Excellent choice to change water and clean the gravel for fish tank. Package list: 1 * Aquarium Fish Tank Gravel Sand Cleaner Siphon Pump Water Charger with Water Flow Adjuster (Squeeze Free)