Duckweed is a common issue for pond owners. This green weed consumes nutrients, light, and oxygen from the water. Duckweed Control is a bacterial treatment that targets the nutrients essential for common duckweed growth, inhibiting its return after removal. It is safe for fish, wildlife, and pond plants. 1000ml treats ponds up to 9000 liters. For initial dosage, use one full measure per 450 liters. For maintenance, use 10ml per 450 liters weekly.