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Simply so, is liquid chlorine and shock the same thing?

The true difference amongst chlorine does not lie in the form it comes in, but rather from being either unstabilized or stabilized. Liquid chlorine and powdered shock have the same active chemical that work to clean your pool, the difference is in the way that you use them.

Also, how much liquid chlorine do you need to shock a pool with algae? It's a generally accepted notion that 30 ppm of chlorine residual will kill all algae. Assuming that your pool is clean, and you have adjusted the pH, you can now add the granular chlorine to the pool. Most pool shock packages will list directions to add 1 lb. (1 bag) of shock per 10,000 gallons of pool water.

Similarly one may ask, how long do you have to wait to swim after you shock a pool?

24 hours

Can you shock your pool with liquid chlorine?

When using liquid shock it dissolves very quickly and you do not have to pre-dissolve in a bucket and then add water like you do with granular chlorine. Another advantage of using liquid chlorine is that you have no residue so you do not have to brush or vacuum the leftover shock off the bottom of the pool.