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Is there a conversion for ppm to mg/L?

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Is there a conversion for ppm to mg/L?

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My calcium “mini lab test” by Red Sea Fish is measured in ppm’s, but my Seachem Reef advantage that I use to supply calcium uses mg/L and dosage is based on that. The Reef Advantage recommends a level of 400 mg/L-is this the same as 400 ppm’s (which is what level my calcium test recommends). Also, is calcium related directly to alkalinity? Thanks for your (always) well thought out answers-appreciate it. Carolyn >>

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