The pool is 24' round AG. So, we're 13.5+K gals.

This doesn't make sense. What's your initial instinct?

I put 1/2 gal in on Monday am. We had 6 people in the pool for several hours Monday afternoon. That evening, I put 1.5 gals in. I haven't put any more in since. We had 3 more kids on Tuesday.

We back washed, added DE and vacuumed to waste this am prior to receiving reagents.

And then to get a CC chlorine reading tonight? Is it me - or does this sound wonky?