All in One Filtration System - Provides mechanical and biological filtration along with water circulation, all in one device. Built-in UVC Clarifier -Helps reduce algae growth and keeps pond water clear by eliminating green water. Compact & Discreet Design -Submersible unit that stays hidden in the pond, eliminating the need for an external filter. Fountain and Aeration Attachments - Includes interchangeable fountain nozzles to create decorative water displays and an aeration set to help improve oxygenation in the pond. Guarantee - 2 year manufacturers guarantee., Manufacturer: Oase