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I'm not sure if it can be installed after a pool has been installed, try contacting a company who makes these hydrostatic valves and see if it can be done. good luck.

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Q: I was told that my 30 year old pool was installed without a hydrostatic valve Can a hydrostatic valve be now installed with the pool full or must it be emptied?
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There is no filter at the bottom of a pool. Perhaps you are looking at the hydrostatic valve which is there in case your pool is emptied and Will make sure that the pool wont float in ground water.


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