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→Planning considerations
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*Low cost*DIY possible (to lower cost)
|style="text-align:left;"|'''Pros'''
|style="text-align:left;"|'''Pros'''
*Well established technology
*Well established technology
*May be natural looking, although often rectilinear in plan
*May be natural looking
*Need little to no gradient
*Need little to no gradient
*Provides buffer to discharge
*Provides buffer to discharge
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|style="text-align:left;"|'''Pros'''
|style="text-align:left;"|'''Pros'''
*High levels of treatment possible
*High levels of treatment possible
*May be run without power if significant gradient is available
*May be run without power if significant gradient is avaialble
*Can be attractively designed to generate interest in the technology, may be any shape.
*Can be attractively designed to generate interest in the technology.
*Maintenance is technically simple. Sludge easily removed
*Maintenance is technically simple
*Biologically complex and robust
*Biologically complex and robust
*Failure tends to be gradual
*Failure tends to be gradual