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Suppresses duckweed growth - Effectively reduces duckweed for a cleaner, healthier pond ecosystem. Targets duckweed at its root - Starves it of the nutrients needed for further growth. Easy to use - Simply pour, measure, and treat with no mess or fuss. Long-lasting duckweed control - Maintains effectiveness for weeks, reducing the need for frequent reapplication. Available in 250ml, 500ml, 1L & 2.5L