100 is the highest on the scale, but it takes the smallest amount of volume. In other words, adding more solution would result in a lower CYA reading, so halfway to the first graduation results in a reading way over 100.
Re: CYA still high after water change
100 is the highest on the scale, but it takes the smallest amount of volume. In other words, adding more solution would result in a lower CYA reading, so halfway to the first graduation results in a reading way over 100.
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