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Without discussing your growing method a high CD discussion is moot.
For most mj grows hy would you want to waste time, energy and expense to super saturate your water with DO as the superaturation will only be constant with constant effort. It is simple to maintain high DO in a nutrient reservoir. The common problem is how to deliver the high DO water to all root surfaces. The plants roots unless at high temps do not really need high DO.
There is always the possibilty of too much O2 being present.
The type of systems you describe are commonly used with sewage treatment plants where DO demands are hugh. The DO must be supplied at levels much higher that used in any mj growing system. Even then they do not raise the DO above normal saturation levels. They instead go to huge lenghts to supply all the DO needs of all the baceria they purposely grow plus enough excess to keep the DO above 2 ppm.
These system are typically made up of several types of pellets. One type is comprised of calcium hydroxide and sodium hydroxide. What it mainly removes is the carbon dioxide from ambient air. There are other pellets that remove other gasses such as hydrogen.
Sorry Fatman. Right Now I am Growing RCDWC(using converted Waterfarms looking at some MPB style right now as well) also Planning on HP aero set-up very soon( at least for clones). Love what the EZ cloner does and it's as basic as it gets.
The only reason I considered the Oxygen generator was because of the High pressure output and using it in place of say a High-Blow 100-150. You can pick up used High output OG units for about the same price as New Air Pump. HB200 is $800 not cheap for an Air Pump. Low output OG are getting cheaper all the time as well.
I suppose there could be To much Oxygen, but what Issues what it Cause? Some sort of Burn? Has there ever been testing done with levels this high?
My opinion..
In our size systems, not going to do jack. Listen, the best way to raise DO is to simply make millions of bubbles bubbling THRU the roots. Where the roots sit in the water they might get a reading of say 12 but the bubble has a rating of say 20 or higher when in contact with the root. If you have enough bubbles, its kinda like an aero aetup in that the roots get air and water..:sign0023:
Hope that made sence.?
Ahhh, your right.. What do I know :) Obviously about this topic not enough.
Hay, is air a DO of 20 ppm or higher?
Moot question. First air contains no DO. It just does not really matter that room air contains approx 2000 ppm of gaseous oxygen. mj roots receive their oxygen only in the form of dissolved oxygen (DO) not gaseous Oxygen. IE mj plant roots take up water containing DO in order to obtain their oxygen needs.
Water will only hold a very small amount of DO regardless of how much you flow through the water in the way of bubbles and regardless of the concentration of the gaseous oxygen in the air. The importance of running a lot of air through DWC reservoirs is mainly to assure the water is turbulent so that the roots are kept separated my constant movement. Very, very little oxygen from the air bubbles actually dissolves into the water.
Reservoir water can easily be kept fully saturated in recirculating reservoirs for Small tube Aero, NFT and Ebb and Flow systems using no air pump at all. That does not mean the water will contact all roots adequately though.
Lost, turbulence can be provided by pumps that add no bubbles and the water can still easily maintain DO at saturation levels. Air pumps are simply used as they are cheap and little knowledge is needed to use them. Few RDWC/DWC systems are using large enough pumps and airstones for adequate water turbulence.BTW if you see my post I say if you get a do reading of say x (For example 7 in this case...), then the air would have a much higher DO reading (Duh, is is 20% oxygen, get it? anyway i said 20 which is probablly low, but the idea was it was an example...) Your grasping at straws to cover your blunders Lost. DUH gaseous oyygen does not have DO Dude. DUH got that yet? Dissolved oxygen versus gaseous oxygen. Why do you find that confusing.
Obviously you are either confused or know little about this subject. Room air contains 20% oxygen so yes it is 2000 ppm. However like I said that oxygen will not dissolve into the water higher than normal saturation lenels at standard atmospheric pressure. It will simply remain in a gaseous state until it reaches the waters surface and the bubble bursts. IE if the water is already saturated to the ppm standard for the water temp no oxygen will dissolve into the water if the water is at normal atmosphheric pressure. It is simple physics Dude.
Now if your reservoir was a sealed tank at atmospheric pressure partially filled with water, and air containing oxygen is pumped into the tank raising the pressure considerably then the DO will rise. Ie if the pressure is at 760 Torr with a water temp of 20 C the DO will be 9.08 ppm. If you raise the pressure to 780 Torr the DO will rise to 9.32 ppm. However the DO above normal saturation level will turn to gasouos oxygen as soon as the water is again subjected to atmospheric pressures. Ie it will become bubbles and flat to the surafce and return to the room air.
With very high flow rates {Water} (where was that discussed DUDE) Turbulent Dude, Turbulent. and high volumes of bubbles (To a point, after a while its so vigerous that the roots don't grow because they get thrashed around a bit), The plants roots do not care if they are trashed about as long as they are not being ripped into pieces. Plant roots grow large only when they must. Under good turbulent water conditions the plant growth rate will increase regardless of the plants roots not growing larger.you can acheive a higher DO rate that the water could ever provide on its own, but go ahead tell me how wrong I am again, its amusing. :)
Here is where you are wrong.. The bubbles (air, 2000 ppm of oxygen by your call) and the roots are in a DO (I believe this is a real reading) of somewhere between 10-12 depending on temp. When the bubbles come into contact with the roots that is giving them a supercharge of O2. You say that roots only take in DO thru water and not thru the air but thats just wrong with all of my experience. :drink
P.S. if your looking for a cheap pump with 30 outlets try the pondmaster ap-100. quiet and cheap at 140 shipped off ebay :)
Look at some surplus regenerative blowers. The undercurrents sytem is the most heavily arearated RDWC system soald at this moment and it use a pond pump delivering about 1.5 cubic foot per minute and sells for about $150. Look at this Gast blower. It will sell on Ebay for between $100 and $150. It will put out 27 cubic feet per minute. It uses 140 watts versus the pond air pumps 5o watts, but it puts out 18 times as much air.
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