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What one dose does
PARAMETER
1 ml / 100 L
Magnesium
+1 ppm
To raise magnesium by 50 ppm in 100 L: 50 ml.
Maker’s daily maximum: 10 ml per 100 L (10 ml for 100 L).
How it’s used
Bring Ca/Alk/Mg to target, then run 4 days with no dosing at stable salinity; the amount needed to restore levels divided by 4 is the daily dose. Retest weekly and adjust. Dose Mg, then Alk, then Ca, 10 min apart, into the sump.
Cautions
• Max daily rise: Ca 20 ppm, Alk 0.5 meq/L (1.4 dKH), Mg 10 ppm; spread larger corrections over several days
• Add in order Magnesium -> KH/Alkalinity -> Calcium+, allowing 10 minutes between each
• Add to the sump or a high-flow area, away from fish and corals
• If a level is above target, pause until it is consumed, then resume at the amended dose
Part of Reef Foundation ABC
Sources
maxDose derived from Red Sea's 10 ppm/day Mg limit. Target Mg: mixed reef 1350, SPS dominant 1280, SPS frag 1390, ULNS 1220, fish-only 1100 ppm. Low potency means large volumes for big corrections (a forum user reported needing very large daily volumes).