Anjon SN-9 Super Nova Extream 9 Watt Pond UV Clarifier w/ Complimentary UV Bulb &#9989; 9 watt UV clarifier for a pond or water garden up to 900 gallons and flow rate of 300 to 500 gph &#9989; Uses ultraviolet light to eliminate green water algae, creating a clean and healthy pond &#9989; Includes a FREE extra 9 watt UV bulb, a 120 volt AC transformer with 6 foot power cord and a 16 foot power cord to the UV &#9989; For inline use only; not submersible &#9989; 2 year warranty; easy to install and maintain