I am no expert, but I do sell the stuff, and this is what I know.
Seachems stuff is good, it has some magnesium added in.
The stuff I sell is about 1/3 the price but has no magnesium added in, but I also sell magnesium too. It dissolves very quickly. The Seachem stuff dissolves faster because it is grinded into smaller chunks, almost powdery, you could do the same with the stuff I sell, but I have seen no need to do that.
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