I am reconstructing a concrete pool with fiberglass walls. The hydrostatic valve at the bottom is completely overdue for replacement and the entire main drain is falling apart. We removed the old equipment and chipped away parts of the old concrete. Ground water is now passing through as it should but how long should it be flowing? It has already been at least 5-6 days and it continuously rises. We threw a sump in there just to divert it in hopes that it dries up. If it doesn't dry up, how do I cement this hole closed?