A recirculating packed bed reactor or sand contactor installation on Waiheke Island. Primary treated wastewater is distributed over the media surface and trickles through the graded sand undergoing treatment via micro-organisims living on the media. This system produces a high level of treatment quality.

A recirculation tank within an rtPBR system. The riser includes an Orenco screened pump vault and alarm system including high and low level alarms.

A recirculating textile packed bed reactor (rtPBR) installation in the Hunua Area. This technology is an advancement on recirculating sand contactors allowing equivalent treatment within a smaller unit