Ok so I'm having deficiency issues, mainly N! If you want to have a look at my problem then the last page or two of my journel or the defcieny post I made; First Grow - 600w mh/hps - soil - photoperiod What do you see?? (Def) Last thing to do I think is flush. The problem seemed to be from me under feeding so I have no idea how too many salts have built up. But the yellowing hasn't began to stop so last chance saloon. The problem now is I have 4 in a 4x4 scrog. I don't even empty the runoff but let it evaporate (yes I have raised pots, humidity 40 ish and excellent ventilation). I'm in soil and use fox farms nutes. I hered it's easier wth a flushing agent, I think Florakleen was mentioned :/ ? Im in 30ltr smart pots. I want to run the least amount of water through that I can but still giving a needed flush. Need some help here?