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Info: Seachem Reef Advantage Calcium™ Dosing Instructions

BEGINNER: Use 5 g (1 level teaspoon) per 150 L (40 US gallons) twice a week. For precise dosing, use the Seachem Digital Spoon Scale™. Dissolve in at least 250 mL (1 cup) of freshwater. Check calcium every 2 weeks and adjust amount or frequency accordingly.

ADVANCED: Check calcium level, then follow addition regimen above until calcium is adjusted to 380–420 mg/L. Each 5 g/150 L will raise calcium by about 12 mg/L. Quantity or frequency can be adjusted, but do not exceed 10 g/150 L per day. Thereafter, use as required to maintain calcium.

EXPERT: After determining the calcium consumption rate, set up a continuous drip system. Use the following formula to determine how much to add to your top-off water: m=vc/400 (m=grams to add to top off water, v=volume of tank in liters, c=amount to raise calcium in mg/L). [For reference: 1 gallon=3.8 liters, 5 g=1 teaspoon].

DO NOT OVERDOSE: Excess calcium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if calcium & carbonate additives are added on alternate days or at least 30 minutes apart.

 

 

Reef Advantage Calcium™ Dosing Tables

Standard Dose

Adds approx. 12 mg/L calcium

Water Volume 1 qt / 1 L 1 gal / 4 L 10 gal / 40 L 50 gal / 200 L
RA Calcium™ Dose (g) 0.031 g 0.125 g 1.25 g 6.25 g
RA Calcium™ Dose (tsp) 1/120 tsp 1/40 tsp 1/4 tsp 1 1/4 tsp

 

Formula

Want a different result?  Here's how to calculate it:

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Dose in grams =

Your tank volume (gal)  x  the amount you want to raise your calcium (mg/L)   x  0.0104

Do not increase your calcium by more than 24 mg/L in a single day

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Dose in teaspoons =

Your tank volume (gal)  x  the amount you want to raise your calcium (mg/L)  x  0.0021

Do not increase your calcium by more than 24 mg/L in a single day

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