A multiple compound buffer  Waterlife 8.3 Buffer will raise and maintain the pH of aquarium water up to 8.3 by increasing the temporary hardness. 8.3 Buffer will not increase the pH of aquarium water above 8.3 if used as directed. Check pH and dKH levels regularly since naturally occuring acids will erode the buffer over time. Like all Waterlife products, 8.3 Buffer is harmless to nitrifying bacteria. For use in seawater, brackishwater, tropical freshwater or coldwater aquaria.