You can either put some in a sock and hang the sock in front of a return jet or pour it slowly into the skimmer and let it dissolve in the filter which is what I usually do. If you do put it into the skimmer, don't backwash for about a week to give it time to dissolve completely or else you'll just lose it. Do NOT broadcast it across the pool, however, like some labels suggest that you do. You don't want acid granules sitting on your liner.
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