LK or root rot?

I thought I had root rot in my dwc so I decided to flush them. I used ro water with h2o2 and sprayed off the roots. I went back and made a bucket with nutes. The next day I came back and my roots was WAY black. It looks slimey, but its real black like liquid karma. Anyone have this happen to them? There is also some foam in the water. I'm pretty confused. After the flush they was pretty much white. Any help is welcome. Thanks in advance

Update: Roots are coming in like crazy. I'll post some pics later. Must of just been the LK

lk will do that. i found that about quarter strength, max, is all thats needed with the lk and i have run it for a long time. forget the h2o2 and get pondzyme, a beneficial bacteria that will let the roots explode in growth.

Here is a pic. I'm sure I just used way to much. Have you used that pondzyme? Would you suggest using it as a problem solver, all the way thru or both? DWC is a hard nut to crack, but I think this round I got her.

i use the pondzyme religiously in veg and flower. it is a great and cheap product that is just insurance against rot and the side effect is huge roots and healthy plants.