nitrozyme in doc be a bad idea?

i've just started using nitrozyme in rdwc as a foliar feed for my plants in veg and i'm noticing the roots getting a little brown and even maybe a little slimy. i'm wondering if the nitrozyme is getting into my water and causing other problems like pythium. the roots don't smell but i can see there is definitely stunted root growth and when i touch the roots they seem fragile. is nitrozyme an organic product that shouldn't be mixed with dwc systems and is that what could be the cause? i've already eliminated the coolness of the water as it goes through a cooler and is always 17c and the water is very well oxygenated.
 
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