Marine Bufferª will safely raise marine pH to 8.3. It will not raise pH above 8.3 even if inadvertently overdosed. Marine Bufferª is a blended product and is not just sodium bicarbonate or sodium carbonate, commonly sold as a substitute. Such products can raise pH to dangerous levels if not used properly. Marine Bufferª contains sodium, magnesium, calcium, strontium, and potassium salts of carbonate, bicarbonate, chloride, sulfate, and borate. Use Seachem's MultiTest: Marine pH & Alkalinityª to check pH and total alkalinity. Use Marine Traceª to restore the proper level of trace elements required by thriving, healthy saltwater fish.