If 3.5 is the water depth (not the wall height) your pool holds ~ 5300 gallons - if the wall height is 3.5, you have ~ 4500 gallons
To figure out chemical additions, all you need do is click on the "Jason's calculator'' link in my sig and put in your numbers 8)
It'd be nice to have all your pool chemical numbers but, if all you are worried about is the bleach - that's fine, just be sure you know the % of the bleach you will be using when you go to the calculator.
If you haven't already done so, PLEASE read Pool School (also linked in my sig) a couple of times so that you understand ~ what we recommend and WHY we recommend what we do
Have a great summer with the pool (Mark is lucky to have you as his pool girl! you knew enough to come here to do the job right )
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