What Jan is saying is whoever told you that you "must" have your filter set to "recirculate" rather than "filter" when you add bleach is full of it. It has NO negative effect. However, having it set to "Waste" or "Backwash" will dump your new chlorine down the drain.
If you remember your HS chemistry, the formula for salt is NaCl, or Sodium Chloride. Salt-water generators break the salt down for the chlorine ions. BTW, bleach is made from brine.
Carl
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