"Hypocalcium chloride"? Is that really what is says of the label? If so, it's not shock.
However, if you add lots of calcium -- either as calcium hypochlorite ('shock') or calcium chloride (calcium or hardness 'increaser'), you will tend to leave a lot of precipitated calcium carbonate in the water.
If you are *already* using cal hypo pills in the skimmer, there's probably no reason not to add the cal hypo 'shock' via the skimmer as well. Doing so will tend to trap precipitated calcium on the filter, BEFORE it clouds your pool. Just make sure to run the pump for at least 1 hour after shocking in this manner.
OTHERWISE . . . just use plain 8.25% household bleach. On your pool, one gallon will add about 4 ppm of chlorine to your pool.
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