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What one dose does
PARAMETER
1 ml / 100 L
Calcium
+0.009 ppm
Alkalinity
+0.0013 dKH
To raise calcium by 20 ppm in 100 L: 2,222 ml.
How it’s used
Never add powder to the tank. Mix 3 g (1 tsp) per 4 L (1 US gal); for pure water a saturated mix is 6 g per 4 L. Drip only the clear top solution, adjusting rate to hold pH 8.3-8.4; monitor pH and alkalinity.
Cautions
• Caustic; keep pH from spiking.
• Use clear supernatant only; minimize air contact to avoid carbonate precipitation.
• Do not mix with other carbonate/calcium supplements.
Sources
Seachem's page says kalkwasser has 'no impact on carbonate alkalinity' yet also that it maintains alkalinity indirectly; standard chemistry gives ~2 meq per mmol Ca once hydroxide reacts with CO2, so the alk effect is stored as derived. Capacity depends on evaporation rate.