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PPM stands for Parts Per Million, which is the ratio of a substance present in a 1,000,000 (1 million) portion of a (or another) substance. For example, if you divide a pie equally into 10 pieces, each piece would be a part-per-ten, or one-tenth of the total pie. If you cut this pie into a million pieces, each piece would represent a millionth, or part per million, of the original pie. PPM is often used to indicate how much of a sanitizer should be used per a specified amount of water. For example, the recommended amount of chlorine used as a sanitizer for use on a food-contact surface is 50 ppm, which can also be written as 50mg/L. This means that to make a 50 ppm solution, you would need to add 50mg of chlorine to one liter of water.

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