I bought a case of "Shock" from the pool store. I am going to the BBB method. I am just using up some pool store type chemicals first that were left over from last year.

The case that I bought was $10.00 for 4 gallons. each gallon had

15% available chlorine
12.5% Sodium Hypochlorite

Is that better than bleach? Since bleach is 5.25% at just under $2.00 per gal.
Can I use the BBB method and use this instead of the bleach?
Or is this better, since its stronger.

Thanks
Mike