Use +Alk if your PH is under 8.3, +AlkHPH if your PH is over 8.3. SmartReef^TM +AlkHPH (Sodium Bicarbonate) is an alkalinity buffer and part of a 2 part solution or can be used separately.

In order to maintain calcium levels in your aquarium you also must maintain your alkalinity. You want your alkalinity to be in the 9 to 12 dKH range.

SmartReef +Alk is pure FCC (food grade) sodium bicarbonate.

Dosage:
Use our online calculator to determine how to raise initial levels to the appropriate levels. See Pre measured Recipe 1 (PH under 8.3) and Recipe 2 (PH over 8.3) instructions or Bulk Recipe 1 and Recipe 2 instructions for how to dose daily.