Proven to be effective in purifying waste water without requiring any electrical input, these systems are ideal for properties that are not inhabited all year round or where the environmental impact is important. However, they do require a sizeable amount of land and can be costly and timely to install. They are also prone to flooding and often require a pumping system to overcome land lie difficulties. As such these systems should not be used where land is limited, where there is a high water table, where the soil is of a water retaining nature or where there is a problematic terrain.
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