This is what a duckweed pond will look like, why not buy duckweed to feed and protect the fish or frogs or use it as a cleansing medium on nutrient rich waters. Restrict spread of Dengue Fever, Kill mosquitoes, Learn about duckweed, ie duckweed control, what duckweed to buy, duckweed eradication, duckweed to kill algae, Duckweed's value as a commercial food source, Azolla "the pest" and how to get rid of it etc. Look at "free look".

Duckweed Pond of landolita (you may buy duckweed at this site)

Water taken before and after being subject to duckweed control on a Waste Water Treatment Pond shown within this site. (Note the heavy green algal condition before the duckweed has gained control of the algae)