Lees Under Gravel Filter for 1 and 2 Gallon Fish Bowls allows you to maintain fish safely in a bowl or small designer aquarium for long extended periods of time. Keep your tank clean and aerated with this under gravel filter that minimizes maintenance responsibility. Refillable carbon cartridge and plant included. Aerates and purifies water naturallyIncludes plant and carbon cartridgeUnder gravel filter for fish bowls