Why should you know about HBS ultrasonic algae management systems? Toxic algae blooms, harmful algae blooms ( HABs ), fish kills, and harmful algae bloom warnings have become far too frequent in headlines across the globe. Caused by nutrient loading into our waterways from sewage, waste, man-made environmental disasters, over application of fertilizers, and the chemicals used in mitigation processes, algae growth and the associated algae blooms have quickly become the most immediate concern among environmentalists. Toxic algae has devastated a host of native aquatic species and continues to do so.