while interesting, your sampling is very small. but if one took it at face value you would have to figure out the cost differences between clorox and great value and see if that 0.85 difference makes it worth it to buy clorox instead. also, I believe the excess lye in the off-brand bleaches make about a + 0.2 difference per month in ph balance, as opposed to +0.1 with clorox (chem geek came up with that, hopefully I am remembering his post correctly as I can't find it right now).
does it make sense monetarily for you?