where to add bleach?

[mas985]

I don't think it would raise the PH as much as you think it would. It is logarithmic but negative of the PH so high PH has much less effect than low PH. I think bleach has a PH of arround 13 so for non-buffered solutions,

PH = -log10(0.5*10^(-7.5)+0.5*10^(-13)) = 7.8

With buffers as in pool water, it will not change even half of that.

Had to add one more thing. This is the reason that acid works so well when lowering PH and why you don't want to add it to the skimmer. I think I read somewhere that 30% muriatic acid has a PH of -1. So a 50/50 mix would be:

PH = -log10(0.5*10^(-7.5)+0.5*10^(1)) = -0.7

Almost as bad a pure acid. Of course the buffers will resist a change but the PH will still be quite low.