Which is the best way to to measure amount of nutrient in solution?
In Europe, EC has been used exclusively. In the US, most growers have been using TDS. The problem is that, as explained earlier, TDS is a conversion from EC, and different manufacturers use different conversion rates. Different TDS meters may show a discrepancy of as much as 600 ppm when reading the same solution. Last June at the Hydroponic Merchants’ Association conference is was decided that the industry will begin to switch over to EC. This switch over could take years. American growers still seem to want to use TDS meters most often and we supply a wide range of quality ones. Be sure when calibrating these meters to use the correct callibrating solution from the correct manufacturer.
