Kawau Island Septic Tank Auckland….CLIENT BRIEF: Fabricate a septic tank system which can be installed under my property for ease of maintenance, and that does not have to be buried. Include a filter system so the liquid can then be dispersed into vegetation. PROBLEM SOLVED: A four chamber septic gravity fed treatment system with sand filter, delivered and installed to one of Aucklands outer islands. Delivery of a septic tank to Kawau Island North of Auckland. Eco friendly, UV stable, recyclable septic tanks, custom built to your requirements. No job too difficult.