Yeah, I just wanted a figure whether to treat the salts as lab-grade, or lower in purity.
To the average hobbyist, it may not be an exact science, but there is an exact science to it, and it can make a huge difference if you know what you're doing. If you know the purity of the chemicals you're putting in and you also know a ballpark consumption rate of these elements in your tank - it wastes less time trying to get it dialed in and results in less stressful swings in parameters.
Again, this is more a concern to me as I have a small system, where as other users probably are running much larger systems where 10ml of concentrated CaCl2 isn't going to raise their Ca2+ by 100ppm.
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