Our pool developed a large crack and water was leaking about a foot a day. We hired a local pool contractor to renovate it. They chipped out the old plaster and exposed the crack. They patched it with rebar staples every foot or so, then covered it over with concrete. But ground water is still seeping up from the crack, and up through the new concrete. Seems like the water is preventing the new concrete from drying. The contractor says its normal and OK. He said the concrete doesn't need to be sealed and water tight, it's the plaster that does that. Is that true? I'm concerned that if the patch isn't totally solid, it may crack again in the future. I definitely don't want to have to do this job again! Hopefully I'm just being overly paranoid. Any words of reassurance (or concern!) from pool pros? Thanks!