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Septic and Holding Tanks


  • A reinforced structural brace ring to prevent crushing
  • A riser that provides greater flexibility for installation
  • A 4,000L Septic and Holding Tank for increased capacity
  • 15 Year Warranty

Australia’s leading manufacturer of tanks

RELN is an Australian owned company that pioneered modern developments in effluent disposal in the 1950’s. In 1990, we introduced the country’s first injection moulded plastic septic tank that complied with Australian Quality Assurance Standards. 

What is a Septic Tank?
Septic Tanks provide an onsite sewage disposal system for homes on the urban fringe and in rural or remote locations. Effluent flows from the toilet, bathroom, laundry and kitchen into a tank, where liquids, fats, oils and solids are separated. Bacteria in the septic tank consumes the effluent, and leaves behind a liquid which flows on to an evapo-transpiration field. The liquid is evaporated by wind and sun or transpired through plants. 

What is a Holding Tank?
Holding tanks (also referred to as collection wells or pump out tanks) are used to hold effluent when it cannot be disposed of in an evapo-transpiration field. These tanks collect effluent that overflows from a septic tank and store it for pump out by an effluent tanker and safe disposal at a town sewerage works. Holding tanks must be maintained at 1/2 capacity to prevent flotation.