Nothing spoils the appearance and enjoyment of a garden pond quicker than green, murky-looking water. Installing a UV sterilizer is the only guaranteed method for the complete elimination of the green water caused by millions of unicellular, waterborne algae. Algae spores, which are persistent in the air, fall into the pond where they proliferate by rapid cell division. Nutrients from fish waste, decaying plant matter and other organics inevitably present in ponds keep these colonies flourishing and promote the frequent appearance of algal blooms.

UV sterilizers generate ultraviolet radiation of sufficient energy to quickly and effectively kill microorganisms such as algae exposed to this UV radiation. With continuous operation of a properly sized UV sterilizer, your pond remains sparkling clear without harming fish or plant life. This is the kind of killing power you need to eliminate algae spores and keep your pond free of dangerous microorganisms that are harmful to your fish. The units are designed for outdoor use but should be protected from direct effects of weather such as rain or freezing. This is a valuable addition for the serious Koi keeper. Most UV sterilizers can be installed in-line either before or after the biofilter once the pond has completed the Nitrogen Cycle. Completion of the nitrogen cycle takes from five to 12 weeks. Once toxic levels of ammonia and nitrite have fallen to zero and healthy colonies of beneficial bacteria are established in the pond a UV sterilizer can be installed.