The requirement of a septic tank is that it shall be so designed to retain the volumetric flow for a minimum period of 24 hours, thus should each person dispose of 150 litres per day, the tank would safely support a family of 6 people or, should the disposal be 100 litres per person per day, the tank would support 10 persons, and so forth.

The double chamber ribbed tank, manufactured from rotationally moulded polyethylene, is revolutionary and will withstand outer pressures in excess of any other form of similar tank.

The excavation for the tank does not need to be refined and the same applies to the back-fill after placing the tank into the excavation; it is also unnecessary to fill the tank with water during back-filling the excavation - except where an high water table is evident. The excavation dimensions are length 2,000 metres, width 1,500 metres and depth (variable) minimum 1,200 metres.

The ribbed walls eliminate the necessity for a heavily constructed concrete slab being placed over the top of the tank.

The 450mm diameter manhole allows easy access to workers as and when de-sludging is necessitated.

The "Poly-Rib" should not be confused with anaerobic digesters or aqua privies. Our product conforms with every norm of the traditional (costly constructed) masonry septic tank and incorporates the following features; a baffle with centre transfer hole to secondary chamber, scum and sludge barrier, two precisely situated and easily accessible inspection eyes, dip pipes submerged into the fluid area, gasses release duct, and a manhole lid with integral double handles and provision for filling with up to 15 kilograms of concrete ballast. The outlet may be fitted with an eccentric reducer, whereby the discharge pipe may be reduced to 75mm or 50mm diameter for connection to a soakaway, a small bore sewer system, or, a wet land system.

There are two common designs (plumbing) of septic tank systems; in the first instance, the tank can be situated to accept both effluent from the w.c. and sullage water from kitchens and bathrooms and, in the second instance, the tank would accept w.c. effluent only and the sullage water would pass through an optional grease trap and by-pass the tank to discharge directly to the soakaway / french drain. In the latter recommended design, the effluent would be retained for a longer period in the tank which greatly enhances pathogen removal. The "Poly-Rib" system advantages are that the householder may enjoy all the conveniences of a quality water-flush sanitation system without the need of municipal costly sewerage treatment plants, and on-going sewage and effluent removal charges.

In regards to a recommended soakaway/french drain system and design, please refer to the French Drain section.

The tanks are so designed that they may be connected in configurations to permit a larger capita usage, or, to form a conservancy project. But we do not support instances where the site management would desire two family units contributing to one septic tank, although we would agree with any design where one soakaway could well service two septic tanks.




Sales since conception embody customers throughout Southern Africa including Botswana, Namibia, Angola, Zimbabwe, Tanzania and every province of South Africa, with customer variation being RDP housing, schools, farms, coastal chalets, guest houses, game farms, trail cottages, plot holders, squatter camps, mining accommodation, upper-class homesteads and public toilet blocks - to mention but a few applications.

In furthering our aims to assist in the development of acceptable sanitation in rural areas, we offer drawings pertaining to typical site lay-outs and the construction of soakaways or other disposal designs to meet most conditions, apart from supplying a wide range of reasonably priced sanitaryware, kitchenware, grease traps and plumbing requirements.






Kindly consult your nearest hardware merchant, or ourselves, for the price of the various models of the "Poly-Rib" septic tanks, complete with 110mm ø inlet and outlet fittings

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