The cya chart says that at a cya of 40 I should maintain between 5-7 ppm of chlorine. But most places I read say anything above 5 or 6 is unsafe. I am finishing a SLAM process (I think I'm finished lol) so my chlorine level is up around 10 right now, waiting for it to come down to a safe level. Is 6 or 7 safe when the liquid chlorine bottle says it's not?