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Horizontal Sub-surface Flow reed beds consist of an excavation approximately one metre deep which is lined to ensure untreated effluent cannot percolate down into the groundwater. The bulk of the excavation is filled with small, single sized media such as gravel with larger media at the inlet and outlet.

Horizontal Flow reed bed systems are ideal for low strength wastewaters or for pre-treated wastewaters for example,  final polishing at a sewage treatment works.