All forms of chlorine add other things along with the chlorine. Bleach just happens to add about the least -- salt. Plus, it is readily available everywhere and fairly cheap. Cal-hypo adds calcium. Over time, it can cause your calcium levels to get high which can cause cloudy water issues especially when high pH and high alkalinity are also present.
How much chlorine bleach will add to a pool depends on the volume. This bleach calculator may help you. There are also other calcs there as well in the drop-down menu in the upper left. http://pool9.net/bleach-calc/
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Sorry, can't help with the ladder question.
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