how fast do roots grow in dwc?

here are some updated pictures.

3 weeks later and the roots are massive

the top is also growing. its about 14 inches now..wow flowering too nice.
 

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Ahem... 3 weeks in and you call that massive roots? I have had more on day 14 in clone machine tbh.
 
With DWC growth rates can be extreme. You want you nutrient temperature to be spot on 68 degrees IMO. Too cool and it slows growth, too warm and DO levels plummet and root rot becomes an issue.

To truly maximize what DWC can do for your growth rates you will want good lighting, supplemental CO2 around 1200 PPM and running your temps and humidities with VPD in mind (except I drop my humidities and temps in later flower). If you have a fast growing, high yielding strain then it's amazing what can be done with a room setup as such.

If you have a slow growing strain like say MAC 1 then you won't notice such gains. Toss a Gorilla Glue #4 in there and watch it blow the fuck up. Genetics has a lot to do with it. Frankly I think that with DWC some strains just won't work because they have no resistance to pythium, where other strains don't care even if nutrient temps are warm (Kandy Kush). When I ran Kandy Kush I had no chiller and a hot room but she didn't care and made for massive yields of dank ass weed. Tossed a blue dream in there and it just died lol.
 
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