where to add bleach?

[chem geek]

Either way is fine. In my pool, I just pour it in the skimmer while the pump is running.

I know that the basic pH won't harm the copper pipes in the heater, but isn't it a potential problem for a cartridge filter or sand or DE? I don't know, I'm just speculating. If you pour the chlorine quickly into the skimmer, it will raise the pH quite a bit (if you poured at the rate of suction for perhaps a 50/50 mix, then the pH would be only a little less than the bleach pH itself -- pH is logarithmic and doesn't average).

Richard