If I feed half dose of recommended nutrients then does my recommended P.P.M. number fluctuate too?
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Welcome to the community. Could you tell me a little more of what you mean by fluctuating? As in the PPM of nutrients from the run off compared to how much you’re feeding? Age of plant, medium, auto or photo? 
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Well whatever u r meaning if u mix half dose the numbers should be roughly half the amount they r at a full dose. Can’t say exactly as they will never be the same unless u have it down to a science. If u mix a full batch and it’s roughly 1000ppm the half dose should be roughly 500 or so of got u on most tho. Soil coco how old is it ect. This will help alot as ffof and ffhf do not need nutes for 3 to 6 weekish
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