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Seachem Reef Builder


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Seachem Reef Builder


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Reef Buffer™ is intended primarily for use in a reef system where the maintenance of a pH of 8.3 is often difficult. When used as directed, Reef Buffer™ will raise the pH of your reef system to 8.3 without fear of accidentally overshooting the pH to a dangerous level. Reef Buffer™ will also raise carbonate alkalinity. 

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Product Name Price Qty
Seachem Reef Builder 300g
(Usually Ships in 4 - 5 Business Days After Submission of Order)
Seachem Reef Builder 600g
(Usually Ships in 4 - 5 Business Days After Submission of Order)
Seachem Reef Builder 1.2kg
(Usually Ships in 4 - 5 Business Days After Submission of Order)


Reef Buffer™ is a blended product and is not just sodium carbonate. Reef Builder™ should be used to raise alkalinity when pH is not a problem. 

DIRECTIONS: Check pH and alkalinity before use. Use 5 g (1 level teaspoon) for every 150 L (40 gallons) to raise pH by about 0.1 pH units (this will also raise alkalinity by about 0.5 meq/L). Dissolve in at least one cup of freshwater, then add to the tank. The pH of natural sea water is 8.25–8.30. In a well established reef system pH adjustment may be necessary biweekly to semiweekly. Dosing requirements will vary, but do not exceed the recommended dose without checking your pH and alkalinity (alkalinity should not exceed 6 meq/L). If an alkalinity of 6 meq/L has been reached and a pH of at least 8.20 has not been attained or substantial cloudiness that does not clear within 15 minutes is encountered, then the system is not ionically balanced. To restore ionic balance perform a water change or adjust the magnesium and calcium levels to approximately 3:1 Mg:Ca (calcium does not need to exceed 400 mg/L).

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. 1.3 lbs / 600 g

HINT: Use Seachem’s MultiTest: Marine pH & Alkalinity™ to check pH and total alkalinity.

Similar to Brightwell Alkalin8.3

Additional Information

Additional Information


Seachem Reef Builder Material Data Safety Sheet

Product Specs


Manufacturer Seachem


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