Ben Derdundat
- 162
- 18
Ben thanks for the thought provoking post. Any other stuff you can help to educate us with?
Lost,
i think i see what you're asking . . . and after rereading ben's post i think i see the problem.
ben wrote: "Here is a list of water temperatures and the amounts of dissolved oxygen that water contains in relation to these temperatures:"
as i understand it, it should have read "Here is a list of water temperatures and the saturation level of dissolved oxygen that water may be able to achieve:"
as i understand it, there is a maximum level of dissolved oxygen (DO) in water that can be achieved. this maximum level is referred to as the "Saturation Level." the saturation level can vary because of at least three factors: temperature, TDS, and atmospheric pressure.
by cooling our reservoirs, we are trying to increase the capacity of our water to hold more DO.
let's take your example: a reservoir of 74°F nuted water with DO of 6.3 ppm. perhaps it's stagnant, maybe it was aerated a while ago, maybe not, we don't know. what we do know is that it's 74°F and has a DO of 6.3 ppm.
ben's post tells us that 74°F water (likely 0 TDS and at sea level) is capable (in ideal lab conditions) of achieving a maximum of 8.5 ppm of DO.
your 74°F nuted water at a DO of 6.3 ppm isn't yet saturated. (maybe it is, depending on how much stuff you've added to it, maybe not).
let's stick a venturi in that bucket and see if we can get those DO numbers up!
yep, that's great, we've aerated the bucket with a venturi and the DO has risen to 7.6 ppm! that's about 20%!
what ben's post tells us is that no matter how long we keep that venturi going, and no matter how pure we make the water . . . we ain't never getting the DO higher than 8.5 . . . unless we drop the temperature. if we drop the temperature from 74°F to 65°F >>>> we may be able to achieve an additional 10% increase in DO!!
i hope this helps.
Papa
I think the next generation of growers are spoiled in a sense that information can be so easily obtained on the subject of growing cannabis. Trade secretes were never shared so freely before. They don't realize that the information shared here was acquired from years of hands on experience, bd
So you admit you/they follow my work as I have been doing this for over 7 years. I do not want this to sound mean but there in nothing on the UC system worth copying. My rcdwc is much further along then those. Not that I have a problem wanting to improve my system, if I see a good idea I will use it and acknowledge it. JK
JK.....you go girl. ;)
Yea, someone should! Would be great to get some pics and see what is really involved.
For 400 bucks looks looks ok.. What are we looking at, 600 with the pump? What kind of pump? Will an ap-100 work?
hhahah
Did you mean river forest? If you get one let us know...
Muddy River
Not fall out, foam UP. I'm not positive, but it's what makes sense in my head, understanding what foam fractionation is and how it works and all that.Awesome looking technology, but I'm betting the nutes fall out. Anyone else?
I have noticed that the question of whether a chiller is necessary or not when growing in the Under Current has been debated some and I wanted to share some information that might help clear things up for some people. The purpose of chilling the water in an Under Current system or any system for that matter is not only to keep the root zone healthy and free from disease, it is also done so to help increase the saturation level of dissolved oxygen that is in your nutrient solution. The whole point of the Under Current and DWC is to have large amounts of dissolved oxygen in the nutrient solution. This is what causes the plants to be able to assimilate nutrients faster and have such rapid cell growth. bd
Here is a list of water temperatures and the amounts of dissolved oxygen that water contains in relation to these temperatures:
Degrees in Fahrenheit / Dissolved oxygen in ppm
32.0 / 14.6
34.8 / 13.8
39.2 / 13.1
42.8 / 12.5
46.4 / 11.9
50.0 / 11.3
53.6 / 10.8
57.2 / 10.3
60.8 / 9.9
64.4 / 9.5
68.0 / 9.1
71.6 / 8.7
75.2 / 8.4
78.8 / 8.1
83.4 / 7.8
86.0 / 7.5
89.6 / 7.3
93.2 / 7.1
96.8 / 6.8
100.4 / 6.6
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