During this severely hot summer, I have been using about 1 quart of 12% every other day.
You should be able to find 12% somewhere near you. It's made in Eloy and there are many dealers of Hasa products. Here is a link to dealers in Arizona. You may want to call the ones in the east valley to see if they carry the 12%.
Just an FYI, B&L Pool Supply sells it for $12.99 with tax for a 4 gallon pack. They may not be near enough to you but it gives you something for a price comparison.
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