Ballam-Waterslot has yet again introduced another first in its field by way of a double waterproof pit liner, complete with vent pipes and that Company's aesthetic V.I.P. toilet pedestal.

The "twin-tub" liner assembly consists of two interlocking "Poly-Rib" tanks of 1.200 litres each, with an alternating factor in that a cast in situ slab is placed over the coupled tanks, with the pedestal attached to one of the alternating manhole lids, and the other manhole lid remains secured at floor level.

The slab would be approximately 2 mē allowing for a top structure to contain the toilet area, and the remaining inside space would serve as a garden shed cum storage room.

As opposed to a 2 mē constructed top structure, a single compartment of say 1,200 metres x 0,850 metres may be placed on the slab, and then at the time of alternating the tanks, it would be a simple matter to either slide the single structure to the empty chamber area, or dismantle and re-construct.

Allowing for the first holding chamber to be in use say for 3 - 5 years by an average family, it is then a simple matter for the positions of the pedestal and the empty chamber manhole lid to be alternated. The then "full" tank is sealed off and the second chamber brought into use for say the next 3 - 5 years - after which period, the original chamber will contain decomposed human waste matter, which, when removed, may be used as odourless fertilizer; and thus the pit alternating process of usage offers a never-ending span of life.

The manhole apertures have a diameter of 450mm which allows for easy access to scooping out the compost from the sealed chamber.

This latest creation has many advantages, such as the light-weight chambers (46 Kilograms each) which may be comfortably transported over rough terrain and placed in position by two personnel; the excavation needed is only 1,200 metre wide, 3,000 metre long and 1,300 metre deep, and installation designs are available for areas in rocky conditions. Further, no heavy transport to site, no on-site cranes or honeysuckers are required for erection and maintenance purposes.

The complete assembly consists of 2 x interlocking l.d.p.e. tanks, 1 x "Polypedestal" complete with double flap lid, 1 x airtight manhole cover, and 2 x 2,5 metre vent pipes with gauze and clip diffused in the upper ends.

The manufacturer considers the "twin-tub" combination to be far more advantageous than any other pit liner currently available on the Southern African market, especially when taking into consideration cost and durability.

Lastly, but far from least, the end user is assured that no pollution of subterranean waters will ever take place - a boon which will be welcomed by all health and environmental authorities.

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