I opened my pool a few days ago, and immediately dumped in four gallons of liquid chlorine to initiate the kill of the swamp-like appearance. As I took more tests today, I noticed my CYA is very low (below 20), and went to go buy some. I noticed that the bottle says to get the FAC level between 1-4 ppm before adding. Since I am currently SLAMing, my FAC is above 10. Is there any reason that I can't add CYA with the FAC at this level? Is there a detrimental effect that will prevent it from working? Thanks!