I have a 3 year old vinyl lined pool with a vermiculite base. We have significant ground water problems that have caused the liner to float and has left extensive wrinkling and creases in the line. We leave the pool filled in the spring, but every year the liner worsens. This spring we drained the pool and tried to smooth out the liner and fit it back into the coping, but there was no real improvement. We have to replace the liner in the near future.

I have spoken to our installer about adding hydrostatic pressure relief valves, both in the deep and shallow ends of the pool, however, he is not familiar with the relief valves being used on the liner/vermiculite pools.

Question: can the hydrostatic relief valved be used on the liner/vermiculite pools? If so, how complicated is the process? Can an installer who has not done it before successfully handle this?

Any information or help would be GREATLY appreciated.