Marine Buffer, 4 kg / 8.8 lbs Safely Raises And Maintains Ph. In Marine Aquariums At 8.3 A Blended Product That Is Not Just Sodium Bicarbonate And Sodium Carbonate Which Are Commonly Sold As A Substitute Contains sodium, magnesium, calcium, strontium, and potassium salts of carbonate, chloride, sulfate, and borate Remains The Most Effective Ph. Buffer Available On The Market For Marine Aquaria 250 Grams Treats Up To 1000 Us Gallons