I have been using the same bargain bleach (guaranteed value brand from stop & shop) for the last few years with good results. This year after shocking the pool twice I wasn't where I thought I should be, so I took a look at the label. It no longer says 6% sodium hypochlorite , it doesn't have the ingredients at all. The next time I went with the Clorox brand regular bleach (8.25% sodium hypo, 7.85% available chlorine) but they only had 3 gallons left so I bought 1 gallon of the new Clorox regular SPLASH-LESS bleach. When I got home and put on my glasses I took a look at the label and the splash-less bleach DOES NOT SANITIZE OR DISINFECT. The moral to the story is don't be a dummy like me READ THE LABEL.