I read about it in the grow bible,it read that if you take a multivitamin and a few glasses of water,use 1/4 cup urine to every gallon of nutrient solution,for my dro.did it .then i noticed that the leaves turned a pale awesome yellow healthy yellow.it looked awesome and the strain grows gold buds.so i thought it was ok.then i started to worry just to worry i guess,anyway i did a litmus test and my nitrates were through the roof,this may have been from the blood pressure meds i was taking i dont know.Im going to mix a gallon up with urine now and check the ph.see whats up.peace.
ps:the book said its the best source for micronutrient solution because of the multivitamin.and the plants in late stages of flower now shes beautiful.