It's the same thing that 2 little fishes does. It's the same thing that most company's use a form of. Personal friend uses it and it's perfect. Look up Reborn from 2 little fishes
They will melt out OK for calcium carbonate. They might have some phosphates bound to them that skeletons from the ocean might not have. Check the effluent for phosphate. ARM has no phosphates that I have ever tested over dozens of refills.
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