Designed to work with Savio Skimmer units, the Aqua UV Retrofit UV Clarifier eliminates contaminants in freshwater ecosystems. Paired with the Savio Skimmer that removes large debris, the replacement UV light sterilizer & water filter fights off green water algae and other harmful bacteria. The UV pool filtration system is designed to be housed in the Savio Skimmer, which can fit two bulb units. With the longest battery in the industry, lasting 14 months. This saves you costs on bulb replacements, while reducing the difficulty of regular maintenance.