I am so sorry you had to go through that horrible event. And I guess you are right - no real help for my situation. But thanks for the encouragement. And again, sorry you went through that.

"but unless there is something introducing large amounts of "stuff" for the chlorine to kill every night, the only thing you can do it keep it shocked and it will eventually burn off"

Is there something that might be able to introduce large amounts of "stuff"?

No, I never really have tested for ammonia - kind of just assumed that is what I was dealing with and that I had to do the same thing whether or not I knew the ammonia level. I am kind of wishing I had at this point. Would a really high ammonia level have smelled like ammonia? I have smelled the "chlorine" smell, but not anything I would say smells like ammonia.