The first thing to consider before going ahead with this task is whether it is really necessary to empty the pool at all. Many repairs to the pool lining and/or tiles etc. can be carried out by trained divers, without the need to empty the swimming pool at all. However, there are occasions where the pool water will need to be emptied. An example would be if any broken glass somehow found its way into the pool water. Because glass is completely invisible when submerged in water, the entire poo...