Plant problem

[wilson2]

hi 3 plants in rdwc. co2 enrichment 1200ppm. just flipped after 6.5wks of veg. all 3 plants look great 3/4 of my total canopy full in a scrog. I usually maintain ec. at 2, I went away for a week camping. Got back plants all fine, ec down to 1. did a water change which came in at ec. 2.4, mind I did this last water change and there was no nute burn so I figured it would be fine. However last w/c the ec was 2 prior the change. This time it was 1prior the change. 24hrs later the biggest plant has wilted and looks dead, the 2 smaller plants look fine ec 2 ph 6. room temp 30, humidity 40%. water temp 18.5c. optimum light height for my lights is 600 they were at 750 i was trying to encourage stretch. I checked the root system large and healthy. I run 3 air pumps heaps of air. I looked up marijuana garden saver handbook by jc stich. I looked up wilting and 1 of the reasons given is plants can no longer draw up water if the salt levels are higher in the soil then in the plant itself. So I diluted the solution so the ec. is now 1, 24hrs later the plant still looks fucked. Im going to give it another 24hrs if it hasnt come good im ripping it out of the system before it has a chance to contaminate the whole system. Has anyone else experienced this? or no of any other causes? I've been growing rdwc for yrs and have never come across this. No sign of nute burn, possibly a little heat stress but I elevated it to 30 because im running co2 (for the first time) heaps of air circulation. thanks in advance wilson

 

[RichieRich6988]

Did you properly PH the new water or if you used Tap water did you let the Chlorine burn off for a day outside. I had that problem and Chlorine was the culperate. Try adding some Cal mag at half strength it brought mine back but was never as strong as before it happened.

 

[wilson2]

hi 2 of the 3 plants were fine they were smaller, the biggest went toes up I have since removed it. I believe it was due to the nuke change jumping from 1 ec to 2.4 in future ill only make adjustment less than .5 ec. the ph was fine, I dont believe chlorine was the culprit, but it could not hurt to change my water supply from tap to tank water, I have access to both.
thanks wilson

 

[RichieRich6988]

For sure you would not believe how much crap is in tap water. Good job my friend