Use the blagdon minipond water garden green water uv clarifier mpu6000 uvc 9w for effective long term control of green waterthe uv light lamp kills green water algae this is a chemical free solution that produces no detrimental effects to the environment or water qualityit works by drawing the algae into clumps so that it can be picked up by the filter systemwith a 9w power consumption it is economical to run and is also safe and simple to installit comes complete with a weatherpooof low vo