OK ive done a ton of reading the past few weeks and i think im doing ok. My pool seems to be pretty clear for the most part. Recently i learned about CYA and FC levels (the hard way)... So now brings up the question of --- With CYA of 80, the target FC should be around 9, but is this fine to swim in? Everywhere i read says you shouldnt swim in a pool with FC over 4, im confused. I need to keep the chlorine up high enough to counter the effects of CYA, but then what good is it if it cant be swam in?