Each pool has it's own characteristics, and you should always follow the directions that came with your pool. Here are general steps to take to properly winterize your above ground pool. The water supply to the pool needs to be totally disconnected not just turned off. The point where water normally enters, and was just cut off should be connected to a good air supply and a good level of air pressure pushed all the way through the system so it clears out as much water from lines and values as possible. This might need to be done on both sides of any filter system you have in place. If the filter system is sand, the sand should be removed and the sand pot cleaned with the air flow cleaning flush to be done after the removal of the filter sand.