Please help dwc plants are showing dark spots

Do they smell like rotten carrots? Roots don't look happy. I would go sterile. Regular bleach has been used and tested for decades successfully in hydro on a commercial scale.

Nowadays you have gimmick products like "Pythoff" and "UCRoots". They're all chlorine sterilizing agent. Don't be scared away by the sodium present in regular bleach.

The small amount of sodium added helps with water retention and adding bulk in the right dosage. I run 3ppm in DWC. Here's an easy to use dilution calculator:Chlorine dilution calculator

Good luck! Cheers!

Failmore said:

Oh yeah. My bad. But only when needed. Don't use it till the plant tells you it needs it. With RO water is is needed more.

All synthetic nutes have it. Some strains need more. It is 100% strain dependent on whether you need it or not. So have it on hand but do not use it till the plants ask for it.

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K

Wastei said:

Do they smell like rotten carrots? Roots don't look happy. I would go sterile. Regular bleach has been used and tested for decades successfully in hydro on a commercial scale.

Nowadays you have gimmick products like "Pythoff" and "UCRoots". They're all chlorine sterilizing agent. Don't be scared away by the sodium present in regular bleach.

The small amount of sodium added helps with water retention and adding bulk in the right dosage. I run 3ppm in DWC. Here's an easy to use dilution calculator:Chlorine dilution calculator

Good luck! Cheers!

Click to expand...

I read that the micro nuts turn the roots brown

Wastei said:

Do they smell like rotten carrots? Roots don't look happy. I would go sterile. Regular bleach has been used and tested for decades successfully in hydro on a commercial scale.

Nowadays you have gimmick products like "Pythoff" and "UCRoots". They're all chlorine sterilizing agent. Don't be scared away by the sodium present in regular bleach.

The small amount of sodium added helps with water retention and adding bulk in the right dosage. I run 3ppm in DWC. Here's an easy to use dilution calculator:Chlorine dilution calculator

Good luck! Cheers!

Click to expand...

Ok do I add the bleach be for nuts or after

Jest wanted to give a update. I hate when people post for help and when they find it they don't post and help the next person in trouble. Ok I took a lil bit of every one's advice. It's was root rot from the beginning. I had a drip line on the rockwool when I first trans planted and it created the problem. By the time I realized I had root rot they were already 4th week of veg. I got ride of the sicker plant of the 2. So I got a bigger res to help with water temps uped my air pump from 6 wat and added a 18 w with it. chopped the root at the bottom of the pot. Wich looking back now I shouldn't have it jest took that much longer to bounce back. I also use ac duck tape for the top of the res and i used https://www.homedepot.com/p/Reflectix-16-in-x-25-ft-Double-Reflective-Insulation-Roll-with-Staple-Tab-Edge-ST16025/100012574 for the bottom of the res. That alone dropped my temp with the bigger res 3 or 4 degrees.. And if my temp got a lil high I would throw in a frozen 3 liter bottle every couple of days. With room temps around 85.
Be for I did this I had to switch bottles out every 12 hrs.
Far as the root rot it never truly went a way. All I can say is brew a compost tea with or with out root rot . It kept the rot in check and my root grew so fast it's well worth the trouble.
And my last mistake was cheap tds and ph pins blue labs all the way. The cheap ones are ok for the first couple of months but after that they will come back to bite u in the ass. even when they had been calibrated. By the next day they would start reading wrong my tds-ppm was off by 600 ppm and the ph would say 6.2 and really be 5.2. . So after all that was corrected I switched back to the 3 part gh formula. With jest calmag and ro water using https://growdoctorguides.com/dwc/dwc-nutrient-calculator/. Starting of at 30% strength and working my way up to 60% with 2 cups of tea on res Chang and a half a cup watered down and poured in threw the roots. Ever other day. And then I jest went off ÒÒlegilizeitÒÒ chart and it was not much to it after that jest keep ur water levels and ph ppm levels noted refer to the chart and its cake. Thanks everyone for the help cuz I almost gave up but now I'm so glad I didn't go back to coco..
The learning curve is a lil much at first. But it's so much better then drain to waste. Can't say much about dirt never tried.

bonytang said:

Tough to recover from nute lock in dwc imo try and feed on the low side especially in this early stage, 1/4 rate till about week 4 then they can start handle a heavier regimen. If your res is 15g..your probably only using about 10g so basically prep it for 2.5g. Good luck sir.

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For fixing nute lock in DWC just replace the high PPM water with new RO water as is. Let it sit for a day or two and put new water with nutes back in. I had it my first grow and this technique cleared it up like a charm!