I used to use salinity a few years ago and noticed when I got to the bottom of the bucket, the alk was lower than batches mixed from to top of the bucket. Some claimed it was from settling of salts from shipping. Ever since I always roll my buckets before opening. Ive never seen alk drop in a batch I've mixed as there is nothing that can use up the minerals. If there was a drop, it would be caused by poor testing.
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