Aqua Man said:

So in that 1.5 gal you need to raise the ppm by 80 of the entire system.

So if you have say 10gal system and you need to raise that 10gal by 80ppm with a 1.5 gal add back.

So 10/1.5 = 6.6

So 6.6x80ppm = 528ppm in 1.5 gal to get ya back there.... or about a 50% mix

Does that makes sense?

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