First of all – My post was not intended as a “flame”. If I offended anyone, my apologies.

My intent was to open a dialog on a subject that seems to be very illusive. No one appears to be willing to back up their belief with hard scientific facts or evidence from the people who have the knowledge to say one way or the other.

Of the 4 sites I posted all mentioned to maintain a 1-3 or 4 ppm FC. The Australian site went on to say not to enter the pool if the CL level was above 4mg/L, if my math is correct that equates to 4 ppm. Several other sites not sited in my post say 5 ppm max. Admittedly they do not mention CYA levels ---- Why is that??? Perhaps it doesn’t matter in the context of their statements. Perhaps they don’t know any better. I do not know.

Believe me ---- I want to swim every available opportunity, but if we have shocked recently and the cl level is still high, I find it difficult to justify, or convince my wife, that it is safe.