Last night, after shocking for most of the afternoon, i took my final chlorine test for the night. At 830pm this is what i got FC: 18.5 and CC: 0.5. This morning at 530 i took a test and this is what i got, FC: 10.5 CC: 0.5. I had to work all day so nothing got added today. when i got home from work i took another test at 430 and got FC: 6 CC: 0.5.
what i don't understand is if organisms break down chlorine, and so does sunlight, why didn't i lost more FC during the day when the sun AND the organisms were breaking down the chlorine? it doesn't make any sense to me why i would only lose 4.5 FC during an 11 hour period where the pool probably recieved 8 hours of sun, but 8.5 during a 9 hour period at night. am i missing something? help please.
i tested everything else 2 days ago and my results were: