adjust cya before or after shocking

[Watermom]

Did you add bleach after you tested last night? How did your FC go from 16 to 18.5 overnight?

[Kateyru]

No, I didn't add bleach after last night's test so I don't know how or why FC went up. Tester error? I am trying very hard to test accurately. Summary of today's test results: 6:30 am, FC = 18.5 and CC <.5 11:30 am FC = 17.5 and CC = 0 3:00 pm FC = 14 so I added 96 oz. of bleach 6:30 pm FC = 18.5
Next steps?
thanks

[aylad]

Just keep doing what you're doing, until you're not losing any chlorine overnight. Then you can let the chlorine drift down to the normal range for your CYA.

Janet

[Kateyru]

FC = 18.5 this morning, same as late yesterday afternoon. So, no more bleach unless 1 of you experts tells me otherwise. When do I increase CYA to get it between 70 and 80 as recommended?

[BigDave]

I just had a thought. Is you SWCG running? (this is not a prank call)

[Kateyru]

Yes.

[BigDave]

OK, that could explain how FC went from 16 to 18.5 without adding bleach.
Can you shutdown SWCG without shutting down pump / filter? If yes, please do.
How's the water look, has the cloudy cleared? Running pump / filter 24/7? How's the filter pressure?
Please test FC, CC, and pH add bleach if FC is below 15 and get a FC reading at dusk so we can see how we're doing at dawn.