Need some help managing nute burn in DWC

Ok so I started off this burn by doing dumb things- not monitoring ppm, and I let it jump from 1200 to 1800. This is with using lotus nutes. I also use powersi, slf-100 and orca, with a small bit of great white.

I lowered it back to 1400, but figured since they didn't burn at 1800 I should be good. But later I got the first burnt tips and curling down, showing nitrogen toxicity.

Replaced res, lowered to 900ppm. Didn't keep burning but kept showing curled down leaf tips. I lowered ppm to 800, still looked rough, so a few days later I did a full swap, from lotus nutes to GH flora series, 525ppm with calmag. Next day it rose to 575 ppm, with .5-1gal water being drank.

Now the burning is progressing, the leaves still look shit, and I reduced ppm even further to 425 last night. Staying at 425 this morning (after it's entire light cycle)

Also I got this weird white stuff growing on some of the roots.

First thing I would try is straight ph'd water for 24 hrs.. Then go back to 450ppm..

Brown roots? You have something else going on too. You might have an O2 problem. I'd try to get some peroxide in your mix or just soak those roots in some diluted peroxide for fifteen minutes and clean out your rez and start a new batch of nutes maybe 200ppm, get another air pump with more power.

warble said:

Brown roots? You have something else going on too. You might have an O2 problem. I'd try to get some peroxide in your mix or just soak those roots in some diluted peroxide for fifteen minutes and clean out your rez and start a new batch of nutes maybe 200ppm, get another air pump with more power.

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It's not really brown, just stained a bit from nutes. I for sure do not have an O2 problem lol. I have two 10w air pumps putting out a massive amount of air, plus a "waterfall" from my chiller loop. I actually had to turn my pumps off to get that pic cause otherwise the bubbles covered it.

The only thing abnormal is the stuff sticking to the roots. Which I think may be from too much beneficial bacteria but not sure. It's also only in this area, rest of the roots seem normal.

HydoDan said:

First thing I would try is straight ph'd water for 24 hrs.. Then go back to 450ppm..

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Thanks. I didn't want to fully stop nutes cause I don't want to prevent bud growth. I'll try to make a clean res tomorrow and add nutes back Sunday.

Are the roots slimey? If not, then I would say just keep on keeping on.

warble said:

Are the roots slimey? If not, then I would say just keep on keeping on.

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Yeah no slime. I did have root rot very early in my grow in a different area, so I know how it looks. I figured just ignore it but wanted to check lol.