Quote Originally Posted by CarlD
You can buy 5 gallon carboys of 12.5% liquid chlorine at poolstores. Since it's twice as strong (if it's fresh) you'd only need 10 of these.

There is now a spigot sold for the carboys so you can get the chlorine out without spilling it all over. Maybe these aren't new, but I just discovered them on Sunday...
I saw something pretty interesting this morning....I was picking my daughter up from swim team practice at the outdoor rec pool here in town, and I saw a truck delivering these 5 gallon carboys to the pool. The label said 12.5 sodium hypochlorite. I was amazed (and impressed) to see this HUGE pool using liquid chlorine. It made me feel better about her swimming in that water..