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PPM to GPG Conversion Formula:
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The PPM to GPG conversion is used to convert water hardness measurements from parts per million (ppm) to grains per gallon (gpg). This conversion is essential for water treatment professionals and those working with water softening systems.
The calculator uses the conversion formula:
Where:
Explanation: One grain per gallon is equivalent to 17.118 parts per million of calcium carbonate in water.
Details: Accurate conversion between PPM and GPG is crucial for proper water softening system sizing, determining regeneration cycles, and understanding water quality for industrial and residential applications.
Tips: Enter the PPM value (must be greater than 0). The calculator will automatically convert to grains per gallon using the standard conversion factor of 17.118.
Q1: What is the difference between PPM and GPG?
A: PPM (parts per million) measures concentration in milligrams per liter, while GPG (grains per gallon) is a traditional unit used specifically for water hardness measurement.
Q2: Why is 17.118 used as the conversion factor?
A: This factor comes from the relationship between grains (1/7000th of a pound) and gallons, specifically for calcium carbonate equivalent measurements.
Q3: What are typical water hardness ranges?
A: Soft water: 0-3.5 gpg (0-60 ppm), Moderately hard: 3.5-7 gpg (60-120 ppm), Hard: 7-10.5 gpg (120-180 ppm), Very hard: >10.5 gpg (>180 ppm).
Q4: When is this conversion most commonly used?
A: Primarily in water treatment industry, plumbing, and for sizing water softeners where GPG is the standard unit of measurement.
Q5: Are there regional variations in water hardness measurement?
A: While the conversion factor is standard, different regions may use PPM or GPG as their primary measurement unit, making conversion necessary.