This is what a mamposteria pool looks like before the final concrete layer covers the walls and floor. The floor slab will have a double layer of reinforcing and the walls a single two way layer.
Walls are 30cm (12") in thickness on the average and are built from the stone broken up from the excavation and put together with mortar. Those walls seem to be pretty heavy and solid but I have seen what backfill pressure can do over many years so I am having added vertical reinforcing placed on them. They have placed concrete piers every 2 meters (6 feet) or so, but I don't think this helps since those piers are not extended below the footing base. Having those piers does split the wall into smaller panels but it also creates a cold joint which can develop cracks under uneven pressure. The added reinforcing placed at the inner shell should help keep the wall from shifting.
Our pool will be about 7 x 9 meters (23 x 29) feet. It will not be very deep, only 1.5 meters (5 feet).
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