Seachem Reef Builder 300g

It is intended for use in reef systems where maintaining pH at 8.3 is difficult.It raises pH without fear of reaching dangerous levels.
Dosage: Check pH and alkalinity before use. Use 5 g (1 teaspoon) for every 150 L to increase the pH by about 0.1 pH units (this will also increase alkalinity by about 0.5 meq/L).