Quote Originally Posted by chrisexv6
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My experience in my area is that once the pH and alkalinity is set, it doesnt really go anywhere. After that its just a matter of adding chlorine to keep the level decent.
That's my experience as well, which is another one of the benefits of using only bleach to chlorinate: no build up of CYA (from pucks), no build up of calcium (from "shock", i.e., cal. hypochlorite). Only very slight upward pH drift from bleach and fill water.