Hey Carl,My fc is 18 and holding overnight with cc being .5 This is fourth day of schock level holding overnight.(with me adding to it in the evening with about a gallon each evening). My cya is 40. Pool is still as cloudy as it was 4 days ago.Maybe a little lighter. My question is; Do I keep schock level untill clear? Do i raise schock level? What d o i need to do? Also with the cc being .5 and fc at 18 for 4 days now,it seems to me that the .5 cc is what is keeping it cloudy? But ,what I am reading, .5 should be okay. Thanks CarlD for taking your time to read this and offer a Tn hillbilly some help.