nute problems

This is my first dwc grow I don't think my plant is taking up the nutes as it drinks and the water levels drop in my resivor my ppm go way up I am using gh 3 part series any thoughts and help greatly appreciated
 
I use gh nutes as well. The thing with using it is I always use less than what they say because they always want you to use more so that you buy more and you risk giving your plants nutrient burn.
 
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