Red Sea Calcium+ (Reef Foundation A) powder (dry powder, per gram)
calcium
Manufacturer data
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What one dose does
PARAMETER
1 g / 100 L
Calcium
+3.6 ppm
To raise calcium by 20 ppm in 100 L: 5.6 g.
Maker’s daily maximum: 5.5 g per 100 L (5.5 g for 100 L).
How it’s used
Same Foundation routine as the liquid: find 4-day consumption, divide by 4 for the daily dose, retest weekly. Either add powder directly or make a stock solution (1 kg to 1.8 L RO water) that doses like the liquid.
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: 20 ppm/day / 3.6 ppm per g = 5.6 g per 100 L/day (rounded down to 5.5). Stock solution: manual table says dissolve 1 kg in 1.8 L (US: 2.2 lb in 3.8 pints), concentration 550 g/L, 1 ml/100 L = 2 ppm Ca.