Thanks to Feidhlim Harty of FH Wetland Systems for information and pics.

Féidhlim Harty is an environmental consultant and writer, and director of FH Wetland Systems Ltd., a company specialising in wetland and reed bed design, willow systems and habitat enhancement. He is the author of _Septic Tank Options & Alternatives_ and _Permaculture Guide to Reed Beds_, both published by Permanent Publications.