Great info, thanks Claude. There's also the "Wastewater Garden" option that seems to use a much deeper bed (1 meter or so) also filled with gravel. Here are some links and nice pictures of working examples all over the world:
http://www.carpathians.pl/gardens/lutowiska.html
http://www.enn.com/features/2000/05/05292000/wastewatergarden_11024.asp
http://www.acumen-env.com/wastewatergardenE.htm
PCRF Wastewater Gardens:
Dr. Mark Nelson
9 Silver Hills Road
Santa Fe, NM 87505 USA.
Tel: 505-474-0209
Fax: 505-424-3336
email: nelson@biospheres.com
Regards,
Peter
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