I grew using Seagrow 16-16-16 start to finish. I never exceeded 650 ppms I kept it at 600ppm. High ppm in DWC is a waste of nutes. Go on youtube and look at HygroHybrid's grows. 1lb.+ plants every grow and he never exceed 600-700 ppms. In fact, he inspired me to do my first grow in DWC.