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 - ColorTransparent - Material: Acrylic. - Size: Approx. 25x0.7x0.7cm. - Made of durable acrylic, beautiful design, compact structure, easy to use. - Controlling the water flow as needed with water Adjuster freely and easily. - for fish tank’ s . - Excellent choice to change water and clean the gravel for fish tank. Package list: 5 x