SodaLicious
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I had massive root rot issues in my RDWC, no matter what I used, until I got my water temps down to the low 60s. 62 is where I'm told pythium rot stops growing, and colder water holds more dissolved oxygen than warm water does, which helps those levels. once I got my water temps under control, root rot was suddenly a thing of the past, no bennies required. I occasionally inoculate with H2O2 and I use bleach to clean between runs, but the only root zone product I use with plants in place is DM Zone, and even then not very often. I haven't had the guts or time to try beneficial tea, but my guess is it would work even better at these temps than it would at warmer ones, due to the extra dissolved oxygen in solution.
You didn't mention what kind of system you're running, or any of your current environmental measurements, so I hope this helps.
Adding H2O2 to your water is NOT the same as increasing oxygenation. If it were, then either airstones would kill all waterborne microbes, or H2O2 wouldn't kill any of them...
My roots always have been slightly brownish ever since i started growing rdwc. This round I have kept temps at 62 and everything is pure white.