Quote Originally Posted by Watermom View Post
The FC and CC comparisons that you need to note are the numbers taken an hour after the evening dose of bleach and the readings taken the next morning within two hours of sunrise. Seeing what kind of overnight loss you have is an essential piece of information.
Several nights ago I added ~9 gal. of 6% bleach. Embarassingly, with the high levels of FC, I ran out of the reagent to check FC! I haven't added any bleach since then.

Last night readings: Temp 78F; FC 7.4; CC 0.4; pH 7.5; TA 130; CH 170; CYA 75

This morning FC 7.2

Am I right to be encouraged by the steady (within measurement accuracy) FC level?

CYA level seems to have declined slightly (9 days ago it was ~75-80). My Chlorinator is turned off. Will CYA gradually come down if my FC is coming from bleach and not stabilized tabs?

Thanks again for your help, it really is appreciated!

Peter