I've been using bleach successfully since renovating our pool 10 years ago. I've been buying it at Sam Club, 3 bottles in a convenient to carry and store box. Initially the 1 1/2 gallon bottles were 6% sodium hypochlorite, then one day they had changed to smaller bottles, 2.83 gallons, but had increased the percentage to 8.25 % with a notice on the box of the change, and telling folks that the smaller bottles with their higher percentage was equal in strength to the 1.5 gallon bottles. Easier to carry and ship in higher concentration... so good, math remained the same as 1.5 gallons of 6%. Lately I started having problems... where was my chlorine going??? So, yesterday I picked up 3 boxes and noticed that they had added to the box, "NEW! with CloroMax Technology." I needed to know what that was, so, after reading the label, I find they had changed back to 6%, with 5.75% available chlorine. No notice of the change, so, by me not checking the box, I've been adding inadequate amounts chlorine. Quite frustrating... they slipped it right past us, now paying more for less. The price of the three box carton has risen incrementally from just above 8 dollars a few years ago, to more than 9 dollars. Just wanted to mention in case there was someone else like me out there; and a slam to Clorox for such a sneaky little move.