I was wondering how many gallons I would have to purchase to last me around a month? I know there are variable factors but what would be your best guess.

My pool is an AG 18' round about 7500 gallons. Right now I use Tri-chlor tabs in a floater and bleach to shock. I use baking soda and borax. Also my pool is in full sun, not an ounce of shade until 7:30pm and I don't have a solar cover because being such a small pool in full sun it gets warm quick.

My only hesitation on switching to bleach is that I have 2 small children both toddlers, not fun to take to stores right now. The nearest Walmart or any place cheap to buy bleach is about 1/2 hour away. Not the biggest deal but with 2 kids that constantly fight it seems like forever.

Since our season here is short only 3 1/2 months. I would like enough bleach on hand to last me about a month. I have plenty of storage in the basement which has A/C so I shouldn't have to worry about it losing too much potency due to heat/sun etc.