They are all sodium hypochlorite solution, all the same thing.

Grocery stores sell 5.25% and 6%, discount houses sell 3% and pool stores sell 6%, 10% and 12.5% but call it liquid chlorine or liquid shock.

1 gal of any concentration will add exactly that same number to 10,000 gallons of water. 1 gal of 6% adds 6ppm, 1 gal of 12.5% adds 12.5ppm.