Knowing and understanding why they are important and what they mean can be key to a successful water treatment program. There are many units of measure and acronyms used within water treatment. In US English units, ppm is calculated with the following equation: It can be determined by testing the water using titration, colorimetric, or ion-selective-electrode (ISE) methods. PPM is either measured by running chemical tests or calculated. We use treatment chemicals measured and added in ppm to help prevent these problems. Then, when we change the temperature and concentration of the water, these minerals may want to come out of solution. Water, depending on its characteristics, can only dissolve so many parts per million of a mineral. As the water transfers heat, these dissolved impurities in ppm can cause problems in the equipment such as mineral scale and corrosion. We use water as a medium to transfer heat. In water treatment, we use ppm to measure the amounts of minerals and gasses dissolved in water. One liter of water weighs 1 million milligrams so an mg/L equals 1 ppm. A term used many times interchangeably with ppm is milligrams/Liter (mg/L). Using the term “ppm” is easier than having to express concentrations as very small fractions or large numbers (e.g., 0.000016 or 1 car in 13,009,920 feet). The bottom line is that a part per million (ppm) is a very small quantity of something in a very large amount of something else. So if the average car is 13 ft long and the distance from Cleveland to San Francisco is 2,464 miles PROOF: 2 years x 365 days/yr x 24 hrs/day x 60 minutes/hour = 1,051,200 minutesġ car in bumper-to-bumper traffic from Cleveland to San Francisco is a part per million PROOF: 16 miles x 5,280 ft/mile x 12 inches/ft = 1,013,760 inchesġ minute in 2 years is a part per million Here are some examples of one part of something in a million parts: The phrase “Part Per Million” is a term we use to describe very small amounts of something in a much larger amount of something else.
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