Maintain healthy, clean, and clear water in your pond with the TotalPond UV Pond Clarifier. It helps remove the green out of the water and prevents nasty odors in ponds up to 800 gallons. As water passes over the UV bulb, it's cleaned of microorganisms that cause green, murky water. Enhanced safety features like the blue indicator light and clear adaptors allow you to see that the unit is properly functioning in your pond. The included 9W UV bulb lasts up to 8,000 hours. Its uncomplicated design allows for simple and quick access to all parts, like accessing the UV bulb for routine seasonal replacement. This clarifier is clearly labeled "IN" and "OUT" near the adapters for easy attachment to your choice of pump. Its versatility is unmatched as it can be submerged in a pond or hidden out of the water. The UV Pond Clarifier is compatible with outlet and inlet adapters that fit ½ in., ¾ in., or 1 in. ID (inner diameter) tubing (not included), as well as your choice of pond pump between 200 GPH - 800 GPH. Built to last, this ETL-listed product is backed by a 1-year manufacturer warranty.