Beemats allows you to create floating wetlands of hydroponic plants (www.beemats.com)
The Science Behind It...
Floating Island Garden (lemmy.world)
Our retention pond in our neighborhood has a lot of algae and problematic plant growth due to the surrounding farms and lawn runoff, so we’re experimenting with a floating island to pull nutrients out before they can cause problems. This will also provide some interesting flowering plants, and more fish habitats....