Stubborn Scaling
There are two types of scaling that are on my mind this morning. The first is the kind that comes from hard water. Hard water is simply water that contains elevated levels of dissolved minerals, primarily calcium and magnesium, picked up as water moves through rock and soil before reaching your tap. It’s measured in grains per gallon (GPG) or parts per million (PPM) with the gradation definitions being Soft: 0–3 GPG, Moderate: 3–7 GPG,…

