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How it worksSpecifications

Click here to download operation manual

Click to download operation manual

Unique South Australian Design:                                                                                                                      
To achieve a system which is reliable, affordable and positive for our environment, South Australian manufacturer Ri-Industries drew on its engineering knowledge and years of experience in producing concrete tanks and related products.

RI-INDUSTRIES examined the common type of water treatment system, which normally uses a concrete tank into which a separate fibre glass or concrete baffle is fitted and then sealed.

It was found that sealing in such a design was not always adequate, so we designed a mono cast model. With integrally cast baffles, our design has been extremely reliable under tests.

No untreated effluent can be inadvertently pumped out into the environment. This of course appeals to environmentally conscious people, who will also be impressed by the relatively low cost brought about by our production methods at RI-INDUSTRIES.

Other physical features of interest include two aeration chambers, 12 volt auto reset alarm, automatic sludge and skimmer returns.

Ri-Industries can provide names of master plumbers and registered drainlayers / installers in your area that are familiar with the RI Treat Systems.


Householders must have units serviced every three months (Check with Dept of Health ) to ensure consistent performance. Although checks of such things as pumps, chlorination, aeration and irrigation systems take place at three month intervals.

Ri-Industries provides customers with a maintenance manual which in addition to detailing maintenance schedules, outlines the remedies whenever certain problems arise. The Ri-Industries domestic Aerobic System, however, will normally work continuously without problems. Most problems of course are encountered in extreme circumstances, like overloading with solid wastes and intrusion of things like rags, newspaper, oils, scraps etc.

How it works:

  1. All waste water is gravity fed into primary sewage chambers where it undergoes settlement and digestion for 24 hours.
    Settled waste water then flows into aeration chambers where air is pumped through in fine bubbles, providing the distribution of air and turbulence required for effective treatment.
  2. Turbulence causes liquids to travel in a circular motion through bio media which encourages biomass growth.The biomass assimilates nutrients and oxygen from the water, leading to a gradual reduction of impurities as the effluent passes through the system.
  3. Effluent and sludge then pass into the settlement chamber, where the sludge settles to the bottom before being returned to the primary chambers, along with the scum which floats in the settlement chamber.
  4. Settled effluent passes through the chlorinator into the irrigation chamber where it is held for irrigation or other means of disposal.

    • Scum and sludge are returned to the primary chambers by a very effective return system which keeps the system functioning for up to three months.
    • The return system enables excess sludge to go back for storage and digestion, suppresses odour -emitting micro-organisms, and encourages micro-organisms to be kept at maximum population levels.
    • Problems of the treatment plant not being used for extended period are reduced.

The Treatment Tank is manufactured from 50 MPa concrete in a mono cast process. Baffles, floor and walls are cast in the one operation using fine tolerance steel moulds which produce reliable wall thick nesses.


3250 6 person 2.5 d -2460 h invert 1700 w approx 6.0 tonne
4250 8 person 2.5d - 2760 h invert 2150 w approx 6.3 tonne
4500 9 person 2.5 d -3060 h invert 2200 w approx 7.0 tonne

The tank capacities are:

  • primary septic chambers 3,250 litres;or 4250;& 4500 litres
  • aeration chambers 2,500 litres;
  • settlement chamber 400 litres;
  • irrigation chamber 400 litres.

Note : All tanks are water tested for 24hrs before despatch


Easily Hidden

No Noise



Unloading the tanks can be a problem ie (Power Lines Telephone Lines-Trees -Branches) House Eves other problems are Steep sloping blocks,Narrow Gates and Short Turning circles as the trucks are 10 metres long  & 2.5 mtrs Wide and have unloading constraints to be adressed that is why we advise a ( SITE VISIT) on difficult sites for piece of mind !

  Designed by Redbax
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