Pondmaster Submersible Ultraviolet Clarifier & Sterilizer [Pond, Replacement Parts] 10 Watts - 700 (1,500 Gallons - .75" Inlet/Outlet)

Pondmaster Submersible Clarifiers feature a glowing monitor halo ring that immediately shows its working. Each Clarifier / Sterilizer includes a 9000 hour bulb, water tight quartz sleeve, transformer and 18' power cord. * Submersible vortex flow design kills algae and algae blooms * Glowing halo ring visible from any angle immediately shows its working * Black color is unobtrusive whether used in or out of the water * 1 Year limited manufacturers warranty (lamp and quarts sleeve excluded) The Pondmaster Sterilizer can be placed outside the pond, and its black color makes it unobtrusive wherever its used. Visible during the day and night from any angle, the soft blue halo shows its working but does not detract from the beauty of your pond. These lights offer great value along with ease of use unsurpassed by any other ultraviolet sterilizer. Light Specifications: 10 Watt : Ponds up to 1,500 Gallons - 700 Max - 3/4" Barb Inlet/Outlet 20 Watt : Ponds up to 3,000 Gallons - 1,800 Max - 1" Barb Inlet/Outlet 40 Watt : Ponds up to 6,000 Gallons - 2,400 Max - 1.5" Barb Inlet/Outlet Light Dimensions: 10 Watt - 1 Light Halo - (12"L x 4"W) 20 Watt - 2 Light Halos - (18"L x 4"W) 40 Watt - 3 Light Halos - (24"L x 4"W) When to use a Sterilizer: Most Koi keepers will keep their unit(s) on year round. But for small garden ponds you may find that only in the spring, with the combination of longer days and an upsurge in fish activity, is necessary. If you do run your year-round, it must be protected from frost in a well-ventilated housing. Remember it is important to replace your lamps annually for peak performance.