The 442 conversion is approximately 700 x EC in millisiemens (mS). There is the 442 conversion (40% sodium sulfate, 40% sodium bicarbonate, and 20% sodium chloride) which some say is the closest thing to a hydroponic solution. Most meter manufacturers in the hydroponics industry use one of two conversions. This is where it may get a little confusing. The problem is lack of consistency among manufacturers when it comes to conversion factors. The fact is that TDS is actually a result of a calculation from EC. Unfortunately many growers in the United States have become very accustomed to using the TDS scale while in most other countries, including Europe, they don't use anything but EC. Some of you may have not even heard of EC and others may have heard of it but do not even know what it is. Some of you may have noticed that some calibration solutions that are marked to read at a certain TDS may actually read different from meter to meter. This all sounds very important but there are some major differences between the different meter manufacturers. By maintaining the correct level of nutrients in the solution your plants will achieve maximum results. This measurement is used by growers to get an idea of how much nutrient is present in the solution. We all know that they are both a measure of the amount of dissolved solids in your nutrient solution. Some additional information for the geeks like usįirst of all lets talk about the differences and similarities between EC and TDS. But the EC is read the same by all meters the only difference is the conversion factor. In other words you could test the same solution with two different meters and get two totally different readings.
On top of that, there are three different conversion factors to determine TDS and different manufacturers use different conversion factors. Because TDS is actually a calculation it is really only a guess at what the nutrient concentration is. TDS is acquired by taking the EC value and performing a calculation to determine the TDS value. TDS stands for Total Dissolved Solids and is measured in PPM or parts per million.
Although they are widely used they should only be used as a guideline and you should always follow mixing instructions on the label of you nutrient.ĮC stands for Electrical Conductivity and is measured in mS/cm or millisiemens per centimeter. These two measurements are used to determine the strength of hydroponic solution. The debate over EC and TDS has been an ongoing issue for a long time. A quick answer to why we should use EC instead of TDS
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