One jug at a time. It has never turned orange. It is real dark yellow now but I never added enough to make it orange to be on the safe side until I get the test kit.
Two things consume chlorine....sunlight and organic material in your pool. Since there was no sunlight (to speak of) between your 11:30PM test and your 8:00AM test, you lost 9 PPM of chlorine to organics (baqua or algae....it doesn't matter) that are still in your pool.Last night at 11:30 I tested and it was holding at 15 and cc's were .5 (only 1 drop). 8:00 am it was at 6 and cc's the same .5.