I have been caring for a pool for just over a week now and when i started it was crystal clear and wonderful but had no detectable chlorine level. CYA is just over 100 so I was trying to keep FC at 12. I just realized tonight that I was doing the math wrong and instead of multiplying by .2 with my 25ml sample using the k2006 I was multiplying by .5. So my levels have been around FC 4.8 instead of 12 like I thought.
I currently do not have a detectable problem... but I am wondering if i should bring the FC level up higher then 12 for a bit or just try to keep it at around 12ish?
It is currently still crystal clear and wonderful!!!