What post are you using, that has pictures you can't see? (URL?).

High chlorine is not a risk for your dogs; until a few years ago, there was NO upper limit on the chlorine in drinking water! I'd be more concerned about CYA, and some of the additives you are using. It's not that I know they are bad for dogs; it's just that I don't know what effect they have.

Be careful about the Taylor booklet; it has some bad advice in it. The kit is excellent but the booklet mostly promotes pool industry standard methods and doctrine -- NOT the BBB method.