I went a couple of years without growing and the left over GH nutes were left where it freezes sometimes. Being cheap I wanted to use them but my plants didn't like it at all. Leaves curled, got crispy and died off. I tossed out the old nutes bought more and my plants thrive now with the new stuff. I had filtered the particles out of the old nutes thinklng it was concentrate but it was just best to toss them. Too much time and effort to fk around with questionable nutrients that may damage your girls. imho