Draining the pool is usually not recommended. It can cause potential cracks in the pool because of groundwater pressure. Especially if you are having an in-ground pool, you need to consult pool experts before taking any steps. Mainly pools are drained during the pool plastering stage. For the above ground pool, the calculated duration by experts is 5 to 7 years. This depends on how frequently the pool is used and the proper pool maintenance schedule.