View Full Version : Electrical Conductivity of Nutrient Solution

03-14-2009, 02:56 PM
Hey everyone!

Overview: I currently have 1 ebb and flow system set up (soon to be 4 once I get a handle on everything). I'm growing a variety of plants (lettuce, spinach, cucumbers, tomatoes) in Rockwool -- all in the germinating stage. Now, I'm a beginner, for sure, and have researched in various places what optimum pH and EC ranges are for the crops I am growing. I have a meter that measures both of these parameters and my question is this: what exactly is the EC telling me? I understand it's a measurement of the ions, i.e. salts, in my solution, but when I see that the EC is decreasing after a few days, how do I know which nutrients I should be replacing in my solution? Is it possible to do this way? Or must the entire reservoir be dumped every few days and then the nutrient solution be made over?

Thanks for any tips, help, and information!

Ashley :)

03-17-2009, 08:42 PM
i change out my solution every two weeks and just replace with ph'd water.