Is it a necessity to put the reagent in 1 drop at a time? Knowing the FC level is going to be high I have been starting with 10 drops and then 5 and then 2 until I start to see it lightening, then do 1 at a time. The reason I ask is my FC test this afternoon was 8.5 (17 drops), I didn't add any chlorine even though I was shocking it. I just tested at 7:00 PM starting with 10 drops, but then just adding 1 at a time, my test results were 10.5, it's possible I miss counted the first test, but I'm pretty good at counting and paying attention remembering the numbers, but I'm pretty sure the FC can't go up without adding chlorine. So either I miss counted, or the way I have been doing the test affected the out come.