UV lights do a few things for you and your pond. They kill harmful bacteria and sterilize the water, creating high water quality so goldfish and koi can thrive. The other thing… they destroy the free floating algae that plagues pond owners. Don’t neglect to add one of these into your filtration system. I know how frustrating it can be to create a beautiful pond, waterfall, surrounded by plantings only to have it turn into pea soup once the temperature gets warm.
