Quote Originally Posted by Willjay View Post
I'd seen in another thread discussing higher chlorine levels to compensate for higher CYA levels conceding that it was fine although it might irritate the eyes more. This is not desirable. I'm sure it was for much higher levels of CYA than 80 but I think I got my wires crossed about the chlorine levels I'd have to run.
I don't know where you read that but it is unlikely to be true. The active chlorine level in the water with an FC that is 5% of the CYA level is less than then equivalent of 0.05 ppm FC with no CYA so 20 times lower than normally found in tap water. The active chlorine level is proportional to the FC/CYA ratio, not to FC alone. A high FC, by itself, doesn't mean anything except how much chlorine is in reserve -- it does not determine chlorine's strength (reaction rate). The chlorine bound to CYA reacts at least 100 times more slowly than unbound active chlorine (i.e. hypochlorous acid).