Pic's are worth a million words for you right now. more info on your system and rez please.

A cyano-bacteria outbrake can cause root rot very quickly. As for the rez water, do you have a TDS meter ?
LOC NAR on probation Reviewed by LOC NAR on probation on . Where did my nutes go? I just swapped out my rez today with a new clean one and put distilled water and fresh nutes in it. Im running botanicare nutes at half strength right now, ppm was at about 400. I checked on it just now, about 18 hours later and the water is almost clear, not the brown tea color is usually is. The roots are now covered in a brown sediment. It looks like the stuff that settles on the bottom of the rez after a few days, or the bottom of the nutrient bottle if you don't shake it up. Any ideas as Rating: 5