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Acid Bufferâ„¢ is a non-phosphate buffer to lower pH and buffer with Alkaline Bufferâ„¢. Both buffers are designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Acid Bufferâ„¢ lowers pH and buffers between 5.0 and 8.0 when used with Alkaline Bufferâ„¢. As Acid Bufferâ„¢ lowers pH it converts carbonate alkalinity (KH) into available CO2. It may also be used to safely lower pH in marine water.