Liquid Marine Buffer, 500 mL (17 oz.) Liquid Marine Buffer will safely raise marine pH to 8.3 while adjusting alkalinity. It will not raise pH above 8.3 even if inadvertently overdosed. Liquid Marine Buffer contains a balanced blend of bicarbonate, carbonate and borate salts designed to raise pH and restore disrupted buffer systems to the proper balance. Use Seachems MultiTest: Marine pH to check pH and total alkalinity. DIRECTIONS: Use 1 capful (5 mL) for every 20 L (5 gallons) daily until pH stabilizes at 8.3. (Note: The 2 L containers cap is 10 mL). This may take from a day to a week depending on original pH, alkalinity and buffer system balance. Thereafter, use as needed to maintain pH.