Duckweed’s greatest asset is its ability to control the growth of algae by forming a blanket above the algae and therefore restricting available sunlight.

The reduction of nutrients have minimal effect on the growth of algae as algae has a far less nutrient requirement than that needed to sustain growth of duckweed.

From This... (Primary Pond Outflow)	... To This (Duckweed Pond Maturation)