I am new to this forum and very excited about BBB method and other the informative discussion here.

Yesterday I went to WalMart got its "GreatValue" regular bleach for $2.20 a bottle with 6% Sodium Hypochrolite. Each bottle is 1Gal 46oz. (about 1.3Gal). My pool is around 11200 Gal. I plug the number into Michael's Calculator. So one bottle of bleach will raise my pool Chroline by 7 ppm. This moring I went to a local Pool store, leslie. I found their Cal Hypoch power shock is at $127 for 100 lb. According to the instruction, 1 lb of this shock will raise Chroline by 1ppm in 80000gal pool. For my pool size 11200 or 7.15ppm. In other words, with bleach I am paying $2.20 for 7ppm, with store shock, $1.27 for 7.15ppm. Am I wrong somewhere ? Why would I go to bleach.

Thanks again for wonderful information in this website.