Hi Bob,
I am also from NW Indiana and this is my first year with BBB. American Sales in Merrillville has 4 Gal. of 12% liquid chlorine for a little under 10.00. That is 16 qts of 12% for 10.00 as opposed to 30 qts of 6% for same price. Since you only use 1/2 the amt of 12% I thought it was a better deal. Just wanted to share this info with you.