Local janitorial supply store - 55 gal drum of 12% for $150

[Water_man]

Thanks for the info gentlemen.

Option number 3 -

Found a 50 pound bag of "Dry Bleach" by franklin technologies for $47.00

MSDS says:
*Sodium chloride - > 50%
*Sodium carbonate - >30%
*Sodium percarbonate - >10%

Can anyone interpret this for me?

MSDS is here:
http://69.149.235.133/images/1/pdf/P710162MSDS.pdf

Don't even think about using it!
Sodium Chloride is your regular table salt.
Sodium perchlorate releases hydrogen peroxide as the oxidizing agent. There's no "active chlorine" species thereneeded for your pool.
Sodium carbonate is washing soda and will increase your pH.
So why is it called "dry bleach"? Because the released hydrogen peroxice does the job of "bleaching", but you don't want that kind of "bleaching".