Three days ago i tested and had a reading of 6 ppm or so ...... had a rainy cloudy day with literally no sun and the solar cover on and i tested the following night and still had a reading of 5 which made sense to me with the cover on and no sunlight.
I added enough bleach to raise me to 6 or 6.5 or so ....... missed the following night due to a baseball game and didn't test or add bleach since we had another (gotta love the northeast) cloudy day with no sun and i figured i could go two days without any problem as i had gone to 6 or 7 ppm and figured i might lose 1 or 2 ppm each day and i should have been fine.
Well imagine my surprise when i do the daily test (OTO?) and got a reading of almost 0 .... i started to freak out and run for the bleach when i thought to myself that there is no way i should be at 0 and instead of adding bleach i did the drop test and lo and behold it read 4 ppm just like i expected to see.
I have also noticed my daily test showing well over 5 ppm but the drop test showed 4 or so.