I've been adding nutes on TOP of my tap water, if I had a tap water with a TDS of 200 and wanted nutes at 400 I would add 400PPM worth of nutes into the res.

If I used RO water with a TDS of 50 I would add 400ppm of nutes

Maybe I've been doing it wrong but thats how i've been doing it and it seems to work great,

but im only on my first grow so dint listen to me too seriously
macro Reviewed by macro 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