PPM

Hey guys,

throughout my readings about the optimum ppm needed for each stage the plant i noticed something,

i read that the stage of veg should be around 600-700 ppm.

I‘m planting in soil and i been feeding plane ph water and the in ppm is 80 and the out is 470 ppm.

when they say my ppm should be 600-700 is it the in or out?

because obviously if the in is 600-700 ppm the out would be much higher.

thanks all