Seachem Reef Carbonate

3 reviews
Seachem Reef Carbonate features both calcium and carbonates for the optimum development of corals in your marine reef aquarium - helping to create a mineral rich water chemistry to supply your corals with the right building materials to grow into something truly beautiful.


  • Reef Carbonate 250ml
    code: Sea666 In stock Only 1 left in stock
  • Reef Carbonate 500ml
    code: Sea663 In stock Only 1 left in stock

Product Information

Seachem Reef Carbonate is a blend of carbonate and bicarbonate which restores and maintains the alkalinity levels of your reef tank perfectly.

Reef Carbonate is a concentrated (4,000 meq/L) blend of carbonate and bicarbonate. Both calcium and carbonates are essential to coral growth and without them the health of your corals will suffer. The corals will stop growing and a decline in their health will follow.

Reef Carbonate will not lower calcium, magnesium, or strontium levels, so you can be confident of the best results. 

Reef alkalinity should be maintained at 3-5 meq/L (8-14 dKH). Alkalinity should not be allowed to fall below 2 meq/L.

The blend of salts results in Reef Carbonate make for a pK of roughly 9.0 in saltwater.



  • Use 1 capful (5 mL) per 80 L  twice a week.
  • Best if diluted into a cup of freshwater, then added.
  • Check alkalinity every 2 weeks and adjust dose or frequency accordingly.


  • Check alkalinity, then follow dosing regimen above until alkalinity is adjusted to 4-5 meq/L.
  • Each dose will raise alkalinity by about 0.25 meq/L.
  • Size or frequency of dose can be adjusted, but do not exceed 1 meq/L per day. 


  • After determining the alkalinity consumption rate, set up a continuous drip system.
  • Use the following formula to determine how much to add to your top-off water:
  • m=va (m=mL of product to add to top off water, v=volume of tank in US gallons, a=amount to raise alkalinity in meq/L).
  • For example, if you want to raise alkalinity by 1 meq/L in a 50 US gallon tank, then you would add 50x1=50 mL into the top-off water.


Best to pour in gradually near strong water movement.

Do not add to a sump or other area of slow water exchange.

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