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might work for that if you try to dissolve it for a long butt time lol.. but my experience is if its hard as rock, its worthless. Itll leave floating white particles in the water and never go away unless mechanically filtered. But thats just me. The salt is cheapo $11 a bag right atm, id toss it and buy new stuff, and open the bag and put it into a instant ocean bucketwell its been a year lol. I got them at my LFS. so might be using it for a quarantine system for fish maybe? and i will label it as QT salt