The TOTAL PPM should be what you target. Add your nutes to the res water, then take a PPM measurement of the well mixed solution in your res. In other words your target is your nutes + water = 400 PPM... make sense?
MVP Reviewed by MVP on . Base PPM and Nutes Something I haven't been able to figure out is... Lets say PPM of tap water is 200, vs RO water which could be 50... if wanted my PPM to be 400 for my reservoir, and Im using tap water with a base of 200 already, Then I would only be able to put as much nutrients in to make it 400, right? But if i was using water if a base of 50 PPM, then I would have 150 extra PPM of nutrients? So does it slow down growth by using water with a high base PPM since you can't add as much nutrients? or Rating: 5