The Boyu UVC A36W Pond UV Filter uses a 36-watt ultraviolet lamp to eliminate algae, bacteria, and pathogens in pond water. It’s ideal for koi ponds, garden ponds, and large aquariums, offering efficient water sterilization and improved clarity. Made With High Quality Plastic And Electronic Components, This Product Is Durable And Aging-Proof. The Lamp Body Is Designed To Be Knock-Down, Easy-Cleaned. Multistage Hose Connector Suitable For Different Sizes Of Tubes. The UV Lamp Produces Strong Ultraviolet Rays, Which Can Effectively Kill Algae, Bacteria And Organisms In The Water, And Restrain The Water From Turning Green Or Smelly, Ensure Your Fish And Plants Healthy, Keep The Water Crystal Clear. High Efficient, Energy Saving, Reliable, Can Solve The Biggest Water Problem For Aquatic Animals And Plants, Can For Whole-Day Using. There Is A Safety Transparent Hole On The Product Which Is For Light Transmission. User Can Observe The Working Condition Of The Light Tube Through This Hole.