I tried to make it simple for myself, so I called the pool guy and asked him to convert from baqua to chlorine. He said no problem, took a water sample to this office, came back and poured 40 gallon 10% sodium hypochlorite shock in my 30,000 gallon pool. When I came home was surprised to see 40 (=fourty !!) empty gallon-sized chlorine shock containers... Though it is too late now, I did the math, and calculated that he raised the chlorine level to 164 ppm with this one large dose of chlorine shock. Is this one of the reasonable conversion methods ? Seems kind of aggressive to me... Please advise (=should I change part of the water before such high chlorine level damages pump/filter/tubing/etc or it is not a concern?!). Thanks