Flexzion Pond Pressure Bio Filter with Ultraviolet UV Sterilizer Light Bulb System Koi Fish Aquarium Tank Water Cleaning Supply Equipment Designated for filtering normal pond water; Extremely efficient and outstanding filtration system Biological and mechanical filter chambers for more efficient removal of dissolved and solid waste and help maintain clean and healthy pond water Provide large surface area and unrestricted water flow for improved cleaning Included an integrated UV clarifier purifier, UV lamp indicator and UV bulbs system for UV treatment which utilizes ultraviolet irradiation to remove algae & other disease-causing organisms ability to reproduce and clump together at the bottom of the pressure filter Flow indicator indicates when to clean; Clean function to wash filter sponges; Easy to clean and install; Inlet and outlet hose adapters, Bio balls, and a multi-directional valve for cleaning