Infinity and wet-edge pools are defined by a single engineered detail: an edge set just below the waterline so the pool appears to merge with the horizon. Water continuously flows over that edge into a hidden catch basin, where it is collected and pumped back into the pool, and maintaining an even sheet of water over the lip is the whole craft of Infinity & Wet-Edge Pools. This is why these pools are always bespoke concrete builds and why the level of the overflow edge has to be controlled to very fine tolerances. The construction process is the full concrete program: structural engineering for the site, certifier or council approval, excavation, steel reinforcement and plumbing, the sprayed shell, then the catch basin, the balance tank that buffers the flow, the recirculation pump, and finally the interior and surrounds. A wet-edge design only delivers its effect where the Ultimo block gives the water somewhere to fall toward, so it suits raised lots, downslopes and Sydney - City and Inner South sites with an outlook; on a flat, enclosed yard the illusion is largely lost. The practical considerations for a Sydney owner are the extra plant and cost of the basin and second pump, the ongoing job of running two water systems, and above all the build precision, because an edge that is even slightly out shows up at once in the water line. Compliance is no different from any pool, with a conforming AS 1926.1 barrier and a pool-register listing required. With careful engineering and an experienced crew across Sydney, an infinity pool becomes the element that organises the entire outdoor design of a Ultimo home around the view it was built to capture.

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Infinity & Wet-Edge Pools in Ultimo, NSW

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