I think Craig is probably right about this one, but it is definitely worth investigating. There are a couple websites out there, where they documented the process of GC'ing a gunite pool. One that comes to mind is something like, howibuiltmyownpool.com or net or something like that. Another one is poolnut.com, I think . . . Seems like I ran across these researching my pool the last several months. Anyway, either way you go, good luck to you. You're on this forum and that's a great start!!

-SJohnson