TDS stands for total dissolved solids, and represents the total concentration of dissolved substances in water. The pH value of a water source is a measure of its acidity or alkalinity. The pH level is a measurement of the activity of the hydrogen atom, because the hydrogen activity is a good representation of the acidity or alkalinity of the water.
First off, it’s important to understand the discrepancy between the terms “guideline” and “regulation”, as this difference is critically important. The term guideline, can be defined as follows: “a line by which one is guided: an indication or outline of policy or conduct” (MerriamWebster, 2008). Meaning, a guideline is often a benchmark that should be followed, but technically, isn’t lawfully required to be followed.