BioSeptic Recycles a Valuable Resource – Water


BioSeptic has been manufacturing supplying and servicing quality aerated wastewater treatment systems (AWTS) for thousands of households since 1992.

An Australian company situated in Narellan (southwest Sydney), BioSeptic is well known for providing homegrown, environmental and economical wastewater solutions.

Years of experience have made the BioSeptic name one of the most recognisable in the industry – a trusted name synonymous with high-quality products and services.

Our Aim

“The BioSeptic aim is to produce the very best aerated wastewater treatment system and then SUPPORT IT WITH THE VERY BEST SERVICE!”


The Directors of BioSeptic, whose parent company is The Martins Group, have been involved in the wastewater treatment industry for over 25 years. BioSeptic Pty Limited was the first business of The Martins Group. BioSeptic has been designing, manufacturing and servicing aerated wastewater treatment systems since 1992. During this time, BioSeptic has become one of the most recognisable names in the water treatment industry by providing customers with an environmentally friendly product from a name they can trust. BioSeptic are the company of choice for the C.S.I.R.O., state and local government departments, some of Australia’s largest building companies and thousands of quality-conscious families.

After many years of success with BioSeptic, construction of a new concrete production factory was done in 2004. After this was complete, Sydney Water Tanks commenced in 2005. Utilising the company’s long history in the water industry and concrete expertise, Sydney Water Tanks quickly became a leading provider of premium underground concrete rainwater tanks. Not long after the success of Sydney Water Tanks, SWT Concrete Pits and Grates commenced, producing a range of engineer designed, high quality and durable concrete pits and grates to the construction industry. The latest member of The Martins Group is SWT Onsite Detention Tanks, offering custom designed stormwater management systems.

The Martins Group is continuing to grow and have built a reputation of developing high quality products that are complemented by outstanding service.

20 Years of Product Accreditation

BioSeptic has been accredited by the NSW Department of Health for 20 years. This important company milestone was achieved in October 2013 and is testament to our commitment to providing high quality wastewater treatment solutions to Australian households.

The high quality you can expect from BioSeptic extends beyond the products that we manufacture. It is our aim to produce the best aerated wastewater treatment system and then support it with the very best service available. With years of experience in the field of wastewater treatment systems, our team is renowned for their knowledge, expertise and excellent customer service.

Our clients have been a great support to BioSeptic, and major builders such as Allworth Homes, Beechwood Homes, Kordovan Homes and Bazdaric Prestige have been consistently installing BioSeptic systems in their customers’ homes for the past 20 years.

Economical and environmentally-friendly solution for wastewater treatment.


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It is our goal to provide outstanding service and solutions, saving Australian businesses and residents money and precious resources.



Our Brands

Family-owned and operated, RIMANT has been in the wastewater treatment industry for 30 years. In 1992, we launched BioSeptic, and we have been designing, manufacturing and servicing aerated wastewater treatments since then.