Reed beds or treatment wetlands is something you want to learn more about?
Our secret door provides access to a wealth of information about constructed wetlands, intended for professionals such as ourselves
or just all those curious beings who want to know how and why helophyte filters work.
But: you have to enter a password …
that is just as secret, of course, but the hint we can give you: What is the plant species we use most in our wetlands?
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