20 Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 39Copyright (c) 2005 John Wiley & Sons, Inc.Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 40Copyright (c) 2005 John Wiley & Sons, Inc.
Water hardness is a measure of the dissolved mineral content of water. There are two types: the general hardness (GH) and carbonate hardness (KH). When keeping freshwater fish and plants, the GH and the KH of aquarium water should match their natural habitat.
A kH level is a measurement of the carbonate hardness of your water. In other words, it measures the concentration of carbonate and bicarbonate ions in your aquarium. kH also indicates your waterâs buffering capacity â your waterâs ability to neutralize added acids without significantly changing the pH.