Adding bleach IS shocking if you put in enough. Shocking is chlorinating to an elevated level, known as the breakpoint. Dumping a packet or scoop of "shock" into the pool doesn't do much but make money for the store where you buy it. You have to know what level of chlorination you are going for and add enough chlorine in whatever form you choose to reach that level. If dealing with algae, test the chlorine several times a day and add chlorine whenever it drops. You may have to add 3 times a day.
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