Stainless Steel UV Light Sterilizer 30 Watts is a powerful inline ultraviolet sterilizer designed to eliminate harmful bacteria, viruses, algae and pathogens from fish pond and aquaculture water as it passes through the unit. Built with a durable stainless steel housing that resists corrosion in continuous aquatic environments, this 30W UV sterilizer is suitable for ponds of up to 2000 gallons and delivers reliable, chemical-free water sterilization that keeps your fish healthy and your pond water crystal clear.