Seachem Acid Buffer (300g)
Lowers KH to lower pH in stubbornly high pH water.
Uses: Acid Buffer™ is used in conjunction with Neutral Regulator™ when the pH is very high or is difficult to lower to 7.0 with Neutral Regulator™. It reduces the carbonate hardness (KH) of the water, making the pH much easier for other products to buffer. If your pH is very high and reisstant to buffering, Acid Buffer™ is your answer!
From the manufacturer: Acid Buffer™ is a non-phosphate buffer to lower pH and buffer with Alkaline Buffer™. Both buffers are designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Acid Buffer™ lowers pH and buffers between 5.0 and 8.0 when used with Alkaline Buffer™. As Acid Buffer™ lowers pH, it converts carbonate alkalinity (KH) into available CO2. It may also be used to safely lower pH in marine water.
Directions from the manufacturer: To lower pH, use 1/4 teaspoon (2 grams) for every 20 gallons (80 liters) daily until desired pH is reached (this dose lowers alkalinity by about 0.2 meq/L (0.6 dKH)). Larger doses may be required in very hard (KH) or alkaline waters.