Developing Fast': Britain Facing...
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For more on marking an answer as the "Best Answer", please visit our FAQ.The amount of loss and regularity is vital. Leakage could come from pipes, skimmers, lights, stuck hydrostatic valve (if there is one in the sump/drain) wall cracks and natural loss through evaporation. Have they tried a bucket test initially? Have they sought professional advice? Why do they think it's the tiles?
wings - it's nice to have company ! Thanks for reply, unfortunately the questions you ask wiill not be answeres for a week at least, as the people concerned are making their way from Turkey, and i will find out then.
The overall depth is 1.5m, and I am sure everything else has been checked and there is no spill into drains or cracks that I know of.