Pondmaster 10W, UV Pond Clarifier, With Transformer & 18' Power Cord, Glowing Monitor Halo Rings, Visible From Any Angle To Immediately Show The Unit Is Working, Includes 9000 Hour, Long Life, 10W Lamp & Water Tight Quartz Sleeve, Fully Submersible Design Exposes Water To UV Light For A Longer Period Of Time, For Ponds Up To 1500 Gallons & Pumps Up To 700 GPH, , 1 Year Limited Warranty.