Quote Originally Posted by moblaine View Post
Am I to be concerned if I lose 1 ppm overnight or 8 ppm overnight? Can you clarify so I'm sure to understand?
1 ppm. It sounded like you did NOT have an 8PM test, with with to compare the 8AM test, but I was pretty sure if you added chlorine as you said, you would get at least 12 - 15 ppm in the pool . . . and if it dropped 2 - 5 by 8AM, you definitely had a problem.

If I add the 4 gallons of 12.% tonight, wait one hour and test and the FC is somewhere around 18 ppm, that means the liquid is still good and not stale?
Probably. If your pool gallon figure is correct (and mostly, they are not!).

Then I test in the morning and if I'm below 10 ppm FC then I have a problem?
Dose in the evening. Test 1 hour later. Retest in the AM. If the PM test is greater than the AM test by more than 2 ppm or more, you need to keep shocking at night. If the difference is 1 ppm or less, you can stop.

We are scheduled for some sunshine over the weekend and into next week after having quite a bit rain lately. Will sunshine possibly help me get rid of some of the chloramines?
Yes.