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Biological blanket weed treatment, ideal for large bodies of water Same safe biodegradable action as barley straw but without the mess Rapid action - No waiting weeks for results Shelf life 3 years, 1 kilo treats up to 160m² Safe to use in water with fish or any other form of aquatic life. Poses no danger to birds, invertebrates, reptiles, wild or pet animals, water plants, human and mammals.