I would suggest not to switch to bleach, but use it in combination with TriChlor. I have done this for about 4 years with great luck. As others mentioned TriChlor tends to drop the pH while bleach will raise it. Thus, I supply half the chlorine needs with bleach and half with TriChlor thus I never have any problems with the pH and never have to deal with things like pH up or pH down.