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hello guys to cut a long story short im a going to veg with a 600w hps and then when i flip to 12/12 im going to add another 400w do you think this will be good for 8/10 plants?

iv been reading books and online info and seeing people talk about ppm / ec can some body explain it please

ok first post... how often would you change water and nutes on your hydro system? for example canna says use coco a and b for one week and i use 1/4 of the recommended strength say 5ml instead of 20ml how meany days would the nutes last before the plants used them and its only water left? if...