Hydrostatic relief valves

Located in the deepest part of the pool.  It may be under the main drain cover or in its own box situated on the bottom of the pool. In vinyl liner pools, it is often integrated into a main-drain pot. It prevents the pool popping out of the ground. It opens when there is an excessive build up of water pressure under the pool allowing the ground ...

Located in the deepest part of the pool.  It may be under the main drain cover or in its own box situated on the bottom of the pool. In vinyl liner pools, it is often integrated into a main-drain pot. It prevents the pool popping out of the ground. It opens when there is an excessive build up of water pressure under the pool allowing the ground water to enter the pool and avoid damage to the pool.