Phantom Of The Opera Water Candles Phantom Of The Opera Candle Trick?

Phantom of the Opera candle trick? - phantom of the opera water candles

Hey, does anybody know how to get the candles not when the water? I know that special candles (in the scene where Erik the Phantom has Christine) to his modest apartment, but I do not know how or why they are facts or anything technical.
It would be a great help, thank you in advance!