Pool is in full sun 9-8. I add bleach every night usually FC is between 5.5- 7 so i use calculator to figure up to around 9. It takes any where from gallon up. My cc is always .5 I have some gray stuff in the skimmer don't know if it's from bathers, lotion etc. or algae. Wondering if I need to shock is that a lot of bleach to add every night or is it because of sun and high CYA? Thanks for any help.. Maybe I should do a overnight FC lost test. What do you all think?