My pool is getting better, but still trying to understand CYA. My FC is 9 right now, I just added 4 gallons of bleach to raise it. Adding this raised my FC to 28. Currently CYA is 30. I have stabalizer in the pool. I have consulted the CYA/Chlorine chart and it says that my CYA should be 70. Is is ok to still slam even though my CYA is not yet where I need it.