Ok but how do you apply those values to your grow. Sorry to be so noobish I normally use soil so this is chinese to meThere are lots of calculators on the net if you do a google search.
Heres one for you
http://www.cannaversity.com/cannaversity/idx.php/22/041/article/Charts-to-convert-ppmECCF.html
Thanks, now I get itThere are really 2 values and they are only marginally related. You want to keep pH between about 5.5 and 6.5. Don't get on the pH roller coaster by checking and adjusting many times a day, do it once a day. The other value is an index of your nutrient concentration whether in EC or ppm. There I recommend you follow the feeding schedule of your nute manufacturer. After you have set the res, measure ppm and that becomes your baseline until the schedule calls for a change and you change the res.