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dedust
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One thing that's important to remember (there are a few things, actually) is that TDS and ppm are calculated from uS (microSeimens, can't be arsed to get ent's special character). That's why the conversion factor is so important.
Another thing is that certain types of molecules simply cannot be measured by electrical conductivity.
does that mean it's better/more accurate to use ppm? or am i completely missing the point? haha...
does that mean it's better/more accurate to use ppm? or am i completely missing the point? haha...
The meters are actually measuring the electrical conductivity with a unit of measure known as microsiemens. Then they use a mathematical conversion to estimate what the total dissolved solids would be in the unit of measure known as parts per million.
Some meters convert using a factor of 0.5 and some use a factor of 0.7. As a result, the exact same water measured with two meters that use different conversion factors will give you a reading in parts per million that are different, while the reading in EC will be the same.
For example, if you tested the same water that has an EC of 1.0 with meters that use different conversion factors they will both read an EC of 1.0 but one meter will say 500 PPM while the other will say 700 PPM.
It is this reason that I do all of my measurements in EC.
It's actually much more accurate to measure electrical conductivity, but ONLY if you're using chemical nutrients. EC cannot be accurately measured with many, if not most, organic compounds and this is due specifically to the nature of the molecules. Measuring organic compounds is complicated and extremely, extremely expensive.does that mean it's better/more accurate to use ppm? or am i completely missing the point? haha...
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