Johnson County is adding 10 of these floating wetlands to South Lake to combat an algae problem. They added the first one five years ago. (You can see it in the background below.) Made of plastic water bottles, the plants on top put their roots through the bottom and draw algae-causing fertilizers out of water, reducing the number of harmful algae blooms on the lake. The lake, which is popular with fisherman, has been closed several times because of algae blooms.
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