I thought it was going to be a simple fix to the decreased bleach % we are seeing produced. I was just going to increase my Stenner pump time by 2.25%. Well it is not quite that simple I found out. This time of year I would run for 40 min/ day ( 8500 gallon ), now I am up to 50 min/day and still not hitting my 6 ppm ( at 3ppm now , cya=50 ). I am going to give it a few days and bump up another 5 min. ( yes been following pool math ). I have been searching the internet everywhere and can not find a valid reason for the % bleach at retail big box stores going down, except for maybe $$$.