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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