Seachem Reef Builder supplies the carbonates and calcium which are essential for all coral growth. It also raises carbonate alkalinity without immediately impacting water pH and will stabilize aquarium water at pH 8.3 with long term use. Raises carbonate alkalinity KH with minimal pH impact Provides a blend of carbonate sources that will not lower pH Will not deplete calcium magnesium or strontium Promotes healthy coral growth If either calcium or carbonates become deficient coral growth will cease followed by a rapid decline in coral health. Used as directed Seachem Reef Builder will not deplete calcium magnesium or strontium which usually tend to precipitate with increasing alkalinity. Seachem Reef Builder and Reef Buffer may be used together use Reef Builder to raise carbonate alkalinity without affecting pH and use Reef Buffer to raise carbonate alkalinity and pH. As a general rule reef alkalinity should be maintained at 3 meqL 84 dKH alkalinity should not be allowed to fall below 2 meqL. Directions BEGINNER Use 3 g 12 level teaspoon per 150 L 40 gallons twice a week. Dissolve in at least 250 ml 1 cup of freshwater. Check alkalinity every 2 weeks and adjust amount or frequency accordingly. For precise dosing use the Seachem Digital Spoon Scale. ADVANCED Check alkalinity then follow addition regimen above until alkalinity is adjusted to 4 meqL. Each 3 g150 L will raise alkalinity by about 0.25 meqL. Quantity or frequency can be adjusted but do not exceed 12 g150 L per day. Thereafter use as required to maintain alkalinity. EXPERT After determining the alkalinity consumption rate set up a continuous drip system. Use the following formula to determine how much to add to your topff water m0.08va mgrams to add to top off water vvolume of tank in liters aamount to raise alkalinity in meqL. For example if you want to raise your alkalinity by 1 meqL in a 200 liter tank then you would add 0.08x200x116 g into the topff water. [For reference 1 gallon3.8 liters 6 g1 teaspoon]. DO NOT OVERDOSE Excess alkalinity may enhance the loss of calcium magnesium and strontium. Do not directly mix with any calcium magnesium or strontium supplement. Best if calcium and carbonate additives are added on alternate days or at least 30 minutes apart.