I try to keep it at 7.2-7.6 to maximize the effectiveness of the chlorine. Which, BTW, I can keep at 1.5-2ppm (EDIT - 30ppm CYA) and stay clear blue. If you'll notice in the pic above, this pool is cut into a hill and I think the deep end is cooled by the ground, so it stays close to 84 degrees F, which might be helping.
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