What does PPM, PWT and TDS mean?

PPS is an acronym for 'Parts Per Million'. It is one of the most popular ways to describe the concentration of silver in solution. In essence it reflects the total available weight of silver within solution.

For example, 1 ppm is approximately equivalent to one milligram of silver per litre. If we extrapolate out to 10 ppm, this equals 10 mg per litre. PWR is an acronym for 'Pure Water Tester', and provides a measurement in microseimens - the unit for electrical conductivity.

TDS stands for 'Total Dissolved Solids', and this is also a measure of conductivity. A good quality testing device will use a combination of these three variables to provide a more reliable reading of true ionic concentration. More.

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