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| | |style="text-align:left;"|'''Pros''' | | |style="text-align:left;"|'''Pros''' |
| | *Well established technology | | *Well established technology |
| − | *Low cost
| + | *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 |
| − | *DIY possible (to lower cost)
| + | *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 |