We have had a problem with water getting behind the walls of our 3 year old vinyl in ground free-form pool since installation. This occurs at almost every area, at different times, after a heavy rainfall. Our pool builder has installed an additional perimeter drain, to no avail.
We have tumbled paver coping and cement decking.
The newest thing they tried was to pull the sealant out between the coping and decking and drill holes where the sealant was, thinking the cement guy poured the concrete wrong. This did not solve our problem.
I asked the builder to go and check the main drain gasket today, he is planning on doing that tomorrow.
I am hoping someone out there has suggestions, we are at our wits end!