Well, I just tested the water again (5 hrs since last test). I used the second bottle of 0871 I just received today.

NOW my FC is 41 and CC is 1 - - how is that even possible?

What to do now...

I ordered the reagents from The Pool Source - but it IS Taylor brand.

Should I presume at this point that the reagent is bad? Is it possible to go from just under 20 ppm FC to 41+ w/ 2 gals of 5.25% bleach? And if so, is it possible it held for over 48 hours?

I'm no mathemagician - but that just doesn't add-up to me!