Regarding the Bleach Calculator...When you input your numbers in this instance, the "quantity = 1 gallon" was unnecessary. Had you just input your pool volume, the 6% bleach concentration you planned on using and the desired ppm increase of 11.4, and then clicked on "calculate," you'd have only seen the 4.3 gallons of bleach needed to raise your pool's chlorine level 11.4ppm.

On the other hand....if you had input your pool's volume, the 6% bleach concentration you planned on using and indicated that you had just the quantity of 1 gallon of that bleach to use, the "calculate" function would have told you that your 1 gallon of 6% bleach would increase your pool's chlorine level 2.6ppm.

In essence, you made the calculator give you 2 different calculations at the same time. Hope this helps.