Aqua Ultraviolet UV Sterilizers will eradicate algae, bacteria, and protozoa without any harmful chemicals or additives! This model features a 25-watt classic UV sterilizer designed for up to 150-gallon reef tanks. It includes a quick-connect union for easy maintenance and clear-blue quartz cap that indicates lamp operation. Recommended flow rates for optimal performance are between 800 GPH to 1200 GPH for reef tanks and 400 GPH for protozoa bacteria management.