This Standard covers the manufacture of conventional septic tanks and their associated fittings for the treatment of domestic wastewater only. This range of tanks typically is designed to cater for:All-waste (Blackwater + Greywater) Blackwater onlyGreywater (with or without kitchen waste included) only and as Holding tanks (collection wells).Septic tanks covered by this Standard are suitable for a flow of domestic wastewater of up to 14,000 litres per week.This flow limit represents an average daily flow of 2000 litres, being from up to 10 persons in a single residence, or an institutional or commercial facility which may have a varying 7 day or 5 day operation averaged out over a full week.ApplicationThis Standard is intended for use by consultants, designers, manufacturers, certifying bodies, installers and regulators.GeneralThis Standard covers only the purpose and requirements of septic tanks and associated fittings. It does not cover the drainage systems leading to the tank, (refer to AS/NZS 3500.2), nor the effluent disposal systems associated with septic tanks, (refer to AS/NZS 1547, (in course of preparation).)Conventional designs and materialsTraditionally certain materials, designs and techniques have been used and have become established. The materials and associated designs shown in Sections 6 to 10 of this Standard have been proven through use and are presented as examples of solutions that are a means of compliance with the provisions of this Standard.Non-standard materials, installations or designsThis Standard does not preclude the manufacture of septic tanks from any material, or in any unusual design, or installation in any non-standard fashion, provided that the completed product and its installation meets the performance requirements and performance criteria given in Section 2 of this Standard.It may be necessary to obtain and supply evidence of third party certification or opinion from people or organisations recognised as having the authority to do so before a regulatory authority will accept a new material or design.Operation and maintenanceSeptic tank systems need maintenance and regular desludging. Operation and maintenance requirements are covered in AS/NZS 1547 (in course of preparation).
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