Biological Treatment that rapidly removes blanket weed, string algae and slime. Ideal for Koi and fish ponds, lakes, water traps, natural pools and irrigation systems. * Hydra Quartz starves the blanket weed by chelating and absorbing nitrates and phosphates which are essential for blanket weed growth; its bacteria and enzymes control and prevent blanket weed for extended periods. * Harmless to all fish, birds, reptiles, invertebrates, humans, mammals, animals and water plants. * Easy to use simply sprinkle or broadcast onto affected areas. * No waiting weeks for results with no messy, smelly straw to remove