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|Soil
|Soil
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+|'''Pros'''
+*High levels of treatement possible
+*DIY possible
+*May be run without power if significant gradient is avaialble
+*Can be attractively designed to generate interest in the technology.
+*Maintenance is technically simple
+*Biologically complex and robust
+*Failure tends to be gradual
+*Will function prior to establishment of vegitation
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|Underdrain||Common||Uncommon
|Underdrain||Common||Uncommon