When you drain a pool, it's like putting a basketball in a tub of water. The ground water pushes up on the pool causing stress. So if you must drain it, clean it and refill as quickly as possible. But only drain it to clean it, otherwise leave the water in and drop the level down below the lights for the winter.
The volume of water, in the pool, essentialy, holds the sides of the pool upright or together. When you release the water,
depending on the temperature and humidity of the ambient air, the structure of the pool will collapse with the rigidity of the element. To drain a pool properly, depends on the weather, otherwise the fragile casting of concrete or plaster will collapse with it.
Generally it's because of a high water table. Pools have to be drained to be resurfaced. Many times they sink shallow wells around the perimiter and run a pump to drop the water table when drained.
due to the amount of pressure applied by the dirt around it. an empty inground pool can actualy "float" out of the ground if the soil is saturated with enough water.
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When you drain a pool, it's like putting a basketball in a tub of water. The ground water pushes up on the pool causing stress. So if you must drain it, clean it and refill as quickly as possible. But only drain it to clean it, otherwise leave the water in and drop the level down below the lights for the winter.
The volume of water, in the pool, essentialy, holds the sides of the pool upright or together. When you release the water,
depending on the temperature and humidity of the ambient air, the structure of the pool will collapse with the rigidity of the element. To drain a pool properly, depends on the weather, otherwise the fragile casting of concrete or plaster will collapse with it.
Generally it's because of a high water table. Pools have to be drained to be resurfaced. Many times they sink shallow wells around the perimiter and run a pump to drop the water table when drained.
due to the amount of pressure applied by the dirt around it. an empty inground pool can actualy "float" out of the ground if the soil is saturated with enough water.