Since the pH is so low, go ahead and do a half a box at a time. Once you start to see the pH move, back down to smaller additions, though. You don't have to wait too long between additions -- a couple of hours should be fine. Then, retest, redose. I would just put it in the skimmer breaking up any clumps, although sprinkling it around the pool is ok. It won't get the ph up any faster, though.
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