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Basically a waterproof membrane to floor and up to a min. height of 150mm or 25mm min. above the maximum retained water level. As in my above attached photograph. What they did not do is the corners up to 1800mm min. height as per photograph. Regards Regrow which is as i have said...

looks like they glassed the walls and membraned the base ,this is against the australian standards for waterproofing ,and a call to your builder should alarm him especially armed with photos