I'm filling in for my other half while he's out of town, so last night our FC levels were 10. It said to add 241 oz. bleach, which I did. this morning, the FC levels are 22. it rained last night, but i doubt that is a factor. I ran the FC tests last night and this morning twice, same result. What did i do? the calculator says not to add anything today...until I test it again at lunch time. am i doing this right?