I started with bleach and thought it was working! 6% sodium hypochlorite. I JUST now am trying the shock for the first time in this rez changeI would drop the hth pool shock and try regular bleach instead. My girls hated pool shock in combination with Jack's. Worked just fine with Dyna Gro though.
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These girls drink 3-4ppm of chlorine (regular bleach) at rez change.