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The builder's concern with the tanks is their risk of "floating" when surrounding soil gets water-logged and the tank water volume is insufficient to counteract the pressure, pushing the tanks upward. The ideal topping currently nominated is a recycled plastic grid holding finely crushed recycled brick and concrete gravel, allowing water to permeate the soil around the tanks and into the water table. The current recommendation from the builder and tank installer is to weigh the tanks down with a concrete driveway.
Limewash painting is almost complete and the VOC-free Queensland-made paint is brightening up the interior.
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