Check the listing for details. SEACHEM MARINE BUFFER 1 KG bottle. Condition: New. Listed at 29.75 USD. Auction is for ( 1 ) : SEACHEM MARINE BUFFER 1 KG Easy-to-use marine buffer safely raises and maintains a pH of 8.3. Contains a natural balance of sodium, magnesium, calcium, and potassium salts of carbonate, bicarbonate, and borate to enhance and maintain buffer capacity at pH 8.3 without sacrificing calcium. Special blended formula maintains both pH and alkalinity (KH) without disrupting the natural ionic balance of marine water even with prolonged use. Dissolves rapidly and does not obscure water clarity. Ideal for marine, brackish or alkaline freshwater aquariums. 1 KG treats up to 4,000 gallons. Please feel free to contact me for International and combined auction shipping rates or with any questions or concerns that you may have about my product. Thank you !