Aquatop Submersible Pond UV Filter with Fountain KitAquatop UVFK Series UV Pumps with fountain kits are a convenient and versatile method to eradicate and control free floating micro organisms that cause unsightly green water as well as disease causing pathogens in both fresh and saltwater aquariums. Eliminates algae blooms Eradicates free floating microorganisms and disease causing pathogens For salt and freshwater aquariums (when the Fountain Kit is not in use) and ponds water gardens The versatility