If you have backwashed the filter since you added the "shock", then it has been washed away and won't be available for your pool. If you have not backwashed the filter, then it will dissolve and eventually make it into your pool--after it finishes sanitizing anything that may be in your filter, if there's any left. If you use granular chlorine in the future, you might want to pre-dissolve it in a bucket of water and pour it in , very slowly, in front of a return so that you get the full benefit of it in the pool instead of in the filter.
Janet
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