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Not that I am a hydro expert by any means, but when you balance your PH are you using proper PH up and down mixtures (and not vinegar/bicarb etc)?
Also, do you use both products in one mixing? (The reason I ask is that apparently you should try to only use one product at a time, if you add too much of either mixture and overshoot your desired PH you should dump your nutes and remix them, instead of using the opposite product to balance it out).
Also, I am assuming that you built your own DWC buckets? What sealant/glue did you use? Is it possible that some of it is breaking down and leeching into your nutes? What about the foil tape, is any of the adhesive sticky side touching the nutes? Hearing about the cloudy reservoir makes me think that something contaminating it for sure...
Good luck, and peace!
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