Alkaline Buffer, 4 kg / 8.8 lbs Raises Ph. And Increases Alkalinity (KHz) A Non-Phosphate Buffer To Raise Ph. And Alkalinity And Buffer With Acid Buffer Designed for the planted aquarium or for very hard water where phosphate buffers may pose algae or cloudiness problems Gentle, Safe, And Enhances The Freshwater Environment 300 Grams Treats 500 Us Gallons