It sounds like root rot to me, I had a similar problem with my DWC system. I discovered I had too high of nutrient concentration levels, I was around 1200ppm, should have been 350ppm, I corrected that problem, and for the roots I made a 10% hydrogen peroxide (H2O2) solution that is: 100ml of 3% H2O2 mixed with 1 Liter of distilled water. The 3% H2O2 is what you will find at walmart, walgreens,etc. for cleanig your cuts or whatever, but NOT the hair bleaching kind, as it is a higher concentration. Anyway use the solution in a spray bottle and mist the roots and the rockwool with it, it will kill the rot, and will eat up the rotten junk, then after 15 minutes or so I spray the roots with plain distilled water and put them into a freshly sterilized system with new water(distilled) and nutes. Do not forget to clean the hydro pebbles, everything must be sterile! Do this every time you change nutes.

I had the same problem, and this has worked very well for me, currently the plants that had the rot are 4 1/2 weeks old and 12' to 14' tall and very healthy.


You can also add H2O2 to the water in your system, it will help keep the rot in check and allow your plants to recover, I also agree with Garden Knowm on all counts, post pics, what type of hydro system is it? and most of all add an airstone to the rez, plants love oxygenated water, algae hates it, and it keeps things mixed up.

PS. do you have a PPM tester? If so, what is the PPM? And how old are the plants? This info would help us to help you.

Hope this helps


L0rdsOth