White foam on cloudy water

[crsuarez]

How do I know the FC is holding steady? For example, yesterday at 9pm I had FC 18.5 and CC of 1, at 1pm I had FC of 12 and CC of 1. How much FC am I suppose to loose because of the sun? Is the FC lost because of direct sun or just because of the daylight?
Thanks for your help...

[Watermom]

You are still losing a lot of FC. Plus, the fact that you have a CC of 1 means that you are still fighting something. You'll be able to tell when your FC is holding steady when you can shock it at night and still have pretty much the same FC level in the morning and when your CC is 0.

[crsuarez]

I will then keep shocking until CC = 0. Thanks!!!!