Let a pool pro. do it for you. Or you will be paying for a new pool.Never empty a pool unless you have some type of well point system, de-watering system around you're in ground pool. If You're pool installer encountered water,clay,any kind of surface water, they had to put a de-watering system to install you're pool.A Good pool co. will leave the system in when they are finished. But, do not drain until you call the installer.