what should the ppm be
 

With any hydroponic setup and when growing tomato like plants, what should the ppm be when you transplant the seedlings to your growrocks?

Then as you go on thru the veg stage what should the ppm be?

Lastly, what should it be during flower stages?

600 - 700 ppm

700 - 1100 ppm

1100 - 1500 ppm