Ben,
It's 30k.
If you can get 5 gallon carboys of 12.5% liquid chlorine it will be a lot easier to add to your pool. Just use 1 gallon of the LC where you were use 2 gallons of bleach. So you'd use 7 to 7.5 gallons of LC instead of 15 gallons of bleach--1.5 carboys rather than 15 bleach bottles.
Rest assured that LC is simply nothing more than double strength bleach. You just use about half as much for the same effect.

While they may look at you funny to see you loading 30 gallons of bleach in your cart, the pool stores will be HAPPY to help load 3 carboys for you...

Carl